diff --git a/.travis.yml b/.travis.yml
index ebac674..3a1a3a5 100755
--- a/.travis.yml
+++ b/.travis.yml
@@ -5,7 +5,10 @@ language: node_js
 dist: trusty
 
 node_js:
-  - node
+  - '10'
+  - '9'
+  - '8'
+  - '6'
 
 addons:
   apt:
@@ -39,6 +42,6 @@ deploy:
   on:
     branch: master
     tags: true
-    node: node
+    node: '10'
   api_key:
     secure: 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
diff --git a/appveyor.yml b/appveyor.yml
index 64f8e9a..2883696 100755
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -5,18 +5,22 @@ skip_branch_with_pr: true
 image: Visual Studio 2017
 
 environment:
-  nodejs_version: "10"
+  matrix:
+    - nodejs_version: "10"
+    - nodejs_version: "9"
+    - nodejs_version: "8"
+    - nodejs_version: "6"
 
 configuration: Release
 platform: x64
 
 install:
-  - ps: Install-Product node $env:nodejs_version $env:platform
+  - ps: Update-NodeJsInstallation (Get-NodeJsLatestBuild $env:nodejs_version)
+  - node --version
+  - npm --version
   - npm install
 
 test_script:
-  - node --version
-  - npm --version
   - npm test
 
 after_test:
@@ -37,3 +41,4 @@ deploy:
       secure: eMIAnmLDhZy2Sq/UAXB50fYr1C2BugaafN8XiV6Wur8wMvPLXWIuCKU7Jt/Y9Of6
     on:
       appveyor_repo_tag: true
+      nodejs_version: "10"
diff --git a/example/errors.js b/example/errors.js
new file mode 100644
index 0000000..820f6f8
--- /dev/null
+++ b/example/errors.js
@@ -0,0 +1,50 @@
+const libui = require('..');
+
+const win = new libui.UiWindow('Errors example', 320, 60, true);
+win.margined = true;
+
+const msg = (err) => {
+	console.log('Another click will terminate the app.');
+	process.removeListener('uncaughtException', msg);
+};
+
+process.on('uncaughtException', msg);
+
+const toolbar = new libui.UiHorizontalBox();
+const setEntryBtn = new libui.UiButton('Uncaught error');
+setEntryBtn.onClicked(() => {
+	throw new Error('ciao');
+});
+toolbar.append(setEntryBtn, false);
+const setSearchBtn = new libui.UiButton('No errors');
+setSearchBtn.onClicked(() => {
+	console.log('clicked');
+});
+toolbar.append(setSearchBtn, false);
+const setPasswordBtn = new libui.UiButton('Set password');
+setPasswordBtn.onClicked(() => {});
+toolbar.append(setPasswordBtn, false);
+
+const setSpinboxBtn = new libui.UiButton('Set number');
+setSpinboxBtn.onClicked(() => {});
+toolbar.append(setSpinboxBtn, false);
+
+const toggleReadOnlyBtn = new libui.UiButton('Set ReadOnly');
+toggleReadOnlyBtn.onClicked(() => {
+
+							});
+toolbar.append(toggleReadOnlyBtn, false);
+
+const box = new libui.UiVerticalBox();
+box.padded = true;
+box.append(toolbar);
+win.setChild(box);
+
+win.onClosing(() => {
+	win.close();
+	libui.stopLoop();
+});
+
+win.show();
+
+libui.startLoop();
diff --git a/example/event-loop.js b/example/event-loop.js
index dd7e4ff..2b8ba59 100644
--- a/example/event-loop.js
+++ b/example/event-loop.js
@@ -128,7 +128,8 @@ function makeToolbar() {
 
 		timeoutHandle = setTimeout((a, b, c) => {
 			const elapsed = Date.now() - now;
-			logAppend(`Custom setTimeout: ${now} - elapsed ${elapsed} ms. Args: ${a} ${b} ${c}`);
+			logAppend(`Custom setTimeout: ${now} - elapsed ${elapsed} ms. Args: ${a} ${
+				b} ${c}`);
 		}, 1000, 'custom', 'args', 2);
 	});
 	toolbar.append(btnCustom, false);
@@ -144,7 +145,8 @@ function makeToolbar() {
 		let now = Date.now();
 		intervalHandler = setInterval((a, b, c) => {
 			const elapsed = Date.now() - now;
-			logAppend(`Custom setInterval: ${now} - elapsed ${elapsed} ms. Args: ${a} ${b} ${c}`);
+			logAppend(`Custom setInterval: ${now} - elapsed ${elapsed} ms. Args: ${a} ${
+				b} ${c}`);
 			now = Date.now();
 		}, 50, 'my', 'args', 2);
 	});
diff --git a/example/forms.js b/example/forms.js
index 74cce2b..9673c45 100644
--- a/example/forms.js
+++ b/example/forms.js
@@ -37,10 +37,6 @@ win.show();
 libui.startLoop();
 
 function setJSON() {
-	const data = {
-		name: name.text,
-		surname: surname.text,
-		age: age.value
-	};
+	const data = {name: name.text, surname: surname.text, age: age.value};
 	JSONData.text = JSON.stringify(data, null, 4);
 }
diff --git a/index.js b/index.js
index 140cafa..9a34991 100644
--- a/index.js
+++ b/index.js
@@ -1,5 +1,5 @@
 const libui = require(`${__dirname}/node_libui.node`);
-const async_hooks = require('async_hooks');
+const async_hooks = require('@creditkarma/async-hooks');
 const EventLoop = libui.EventLoop;
 delete libui.EventLoop;
 
diff --git a/package-lock.json b/package-lock.json
index d3be4a7..ab25807 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -4,6 +4,11 @@
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
+    "@creditkarma/async-hooks": {
+      "version": "0.0.4",
+      "resolved": "https://registry.npmjs.org/@creditkarma/async-hooks/-/async-hooks-0.0.4.tgz",
+      "integrity": "sha1-tbs0g/Ar9yw7LcDrojFm0/awoFg="
+    },
     "abbrev": {
       "version": "1.1.1",
       "resolved": "https://registry.npmjs.org/abbrev/-/abbrev-1.1.1.tgz",
diff --git a/package.json b/package.json
index 91d2085..33ae7f3 100755
--- a/package.json
+++ b/package.json
@@ -12,7 +12,7 @@
     "GUI"
   ],
   "engines": {
-    "node": ">=8"
+    "node": ">=6.14.2"
   },
   "libui": "alpha3.5-master-002",
   "scripts": {
@@ -25,9 +25,10 @@
     "install": "npm run --silent download-libui && npm run --silent download-libui-napi || npm run build",
     "test": "tape test.js",
     "precommit": "check-clang-format \"'npm run lint'\"",
-    "lint": "clang-format -i --glob='{js/*.js,src/**/*.{h,c,m},index.js,example.js,test.js,example/*/*.js}'"
+    "lint": "clang-format -i --glob='{example/*.js, js/*.js,src/**/*.{h,c,m},index.js,example.js,test.js,example/*/*.js,tools/*.js}'"
   },
   "dependencies": {
+    "@creditkarma/async-hooks": "0.0.4",
     "home-path": "^1.0.5",
     "is-ci": "^1.1.0",
     "mkdirp": "^0.5.1",
diff --git a/src/events.c b/src/events.c
index 2c22a6e..73fc4d8 100644
--- a/src/events.c
+++ b/src/events.c
@@ -11,11 +11,11 @@ napi_value fire_event(struct event_t *event) {
 	napi_value resource_object;
 	status = napi_create_object(env, &resource_object);
 	CHECK_STATUS_UNCAUGHT(status, napi_create_object, NULL);
-
-	napi_callback_scope scope;
-	status = napi_open_callback_scope(env, resource_object, event->context, &scope);
-	CHECK_STATUS_UNCAUGHT(status, napi_open_callback_scope, NULL);
-
+	/*
+		napi_callback_scope scope;
+		status = napi_open_callback_scope(env, resource_object, event->context, &scope);
+		CHECK_STATUS_UNCAUGHT(status, napi_open_callback_scope, NULL);
+	*/
 	napi_value cb;
 	status = napi_get_reference_value(env, event->cb_ref, &cb);
 	CHECK_STATUS_UNCAUGHT(status, napi_get_reference_value, NULL);
@@ -28,15 +28,20 @@ napi_value fire_event(struct event_t *event) {
 	if (status == napi_pending_exception) {
 		napi_value last_exception;
 		napi_get_and_clear_last_exception(env, &last_exception);
-		napi_fatal_exception(env, last_exception);
-		return NULL;
+		napi_value stack;
+		size_t string_len = 5000;
+		char stack_str[5001];
+		napi_get_named_property(env, last_exception, "stack", &stack);
+		napi_get_value_string_utf8(env, stack, stack_str, string_len + 1, &string_len);
+		napi_fatal_error("fire_event", NAPI_AUTO_LENGTH, stack_str, NAPI_AUTO_LENGTH);
+		return last_exception;
 	}
 
 	CHECK_STATUS_UNCAUGHT(status, napi_make_callback, NULL);
-
-	status = napi_close_callback_scope(env, scope);
-	CHECK_STATUS_UNCAUGHT(status, napi_close_callback_scope, NULL);
-
+	/*
+		status = napi_close_callback_scope(env, scope);
+		CHECK_STATUS_UNCAUGHT(status, napi_close_callback_scope, NULL);
+	*/
 	status = napi_close_handle_scope(env, handle_scope);
 	CHECK_STATUS_UNCAUGHT(status, napi_close_handle_scope, NULL);
 
diff --git a/src/includes/napi_utils.h b/src/includes/napi_utils.h
index 0f06889..5798a8d 100644
--- a/src/includes/napi_utils.h
+++ b/src/includes/napi_utils.h
@@ -154,11 +154,7 @@ NULL, &ret); \
 		char err[1024];                                                                            \
 		snprintf(err, 1024, #FN " failed with code %d: %s\n", result->engine_error_code,           \
 				 result->error_message);                                                           \
-		napi_value error;                                                                          \
-		napi_value error_msg;                                                                      \
-		napi_create_string_utf8(env, err, NAPI_AUTO_LENGTH, &error_msg);                           \
-		napi_create_error(env, NULL, error_msg, &error);                                           \
-		napi_fatal_exception(env, error);                                                          \
+		napi_fatal_error("", NAPI_AUTO_LENGTH, err, NAPI_AUTO_LENGTH);                             \
 		return ERROR_RET;                                                                          \
 	}
 
diff --git a/tools/lib.js b/tools/lib.js
new file mode 100644
index 0000000..d01a4aa
--- /dev/null
+++ b/tools/lib.js
@@ -0,0 +1,80 @@
+const fs = require('fs');
+const path = require('path');
+const mv = require('mv');
+const https = require('https');
+const homePath = require('home-path');
+const mkdirp = require('mkdirp');
+
+const debug = require('debug')('libui-download');
+
+const requestHttps = url => new Promise((resolve, reject) => {
+	const req = https.get(url, resolve);
+	req.on('error', reject);
+});
+
+module.exports = function(project) {
+	const PROJECT = project.toUpperCase();
+	return {
+		requestHttps,
+		mkCacheDir(cache) {
+			try {
+				mkdirp.sync(cache);
+				return cache;
+			} catch (err) {
+				if (err.code !== 'EACCES') {
+					debug('mkCacheDir error: ', err.stack);
+					throw err;
+				}
+
+				// try local folder if homedir is off limits (e.g. some linuxes return '/'
+				// as homedir)
+				var localCache = path.resolve('./.' + project);
+
+				mkdirp.sync(localCache);
+				return localCache;
+			}
+		},
+		cacheDir(opts) {
+			opts = opts || {};
+			var homeDir = homePath();
+			return opts.cache || path.join(homeDir, './.' + project);
+		},
+		buildUrl(opts, filename) {
+			var url = process.env[`NPM_CONFIG_${PROJECT}_MIRROR`] ||
+					  process.env[`${PROJECT}_MIRROR`] || opts.mirror ||
+					  `https://github.com/parro-it/${project}/releases/download/`;
+
+			url += process.env[`${PROJECT}_CUSTOM_DIR`] || opts.customDir || opts.version;
+			url += '/';
+			url += process.env[`${PROJECT}_CUSTOM_FILENAME`] || opts.customFilename ||
+				   filename;
+			return url;
+		},
+		doDownload(res, url, target, cachedZip) {
+			if (res.statusCode !== 200) {
+				throw new Error(`Https request failed for ${
+					res.headers.location} with code ${res.statusCode}.`);
+			}
+
+			debug(`Https request for ${url} ok with code 200.`);
+
+			const fileWrite = res.pipe(fs.createWriteStream(target));
+
+			return new Promise((resolve, reject) => {
+				const finish = () => {
+					debug('end stream reached', target, cachedZip);
+					mv(target, cachedZip, function(err) {
+						if (err) {
+							reject(err);
+						} else {
+							resolve(cachedZip);
+						}
+					});
+				};
+
+				fileWrite.on('finish', finish);
+				fileWrite.on('error', reject);
+			});
+		}
+	};
+};
\ No newline at end of file
diff --git a/tools/libui-download.js b/tools/libui-download.js
index 180e45d..2617127 100644
--- a/tools/libui-download.js
+++ b/tools/libui-download.js
@@ -2,88 +2,49 @@ const fs = require('fs');
 const os = require('os');
 const path = require('path');
 const mkdirp = require('mkdirp');
-const homePath = require('home-path');
-const mv = require('mv');
 const _debug = require('debug');
-const https = require('https');
 const tar = require('tar');
-const utils = require('util');
+const {mkCacheDir, cacheDir, buildUrl, requestHttps, doDownload} =
+	require('./lib')('libui');
 
-const mkdir = utils.promisify(mkdirp)
 const debug = _debug('libui-download');
-const requestHttps = url => new Promise((resolve, reject) => {
-	const req = https.get(url, resolve);
-	req.on('error', reject);
-});
-
-const pathExists = utils.promisify(fs.exists);
 
 function nodePlatformToOS(arch) {
 	switch (arch) {
-		case 'darwin': return 'osx';
-		case 'win32': return 'windows';
-		case 'linux': return 'linux';
-		default: throw new Error('Unknown platform ' + arch);
+		case 'darwin':
+			return 'osx';
+		case 'win32':
+			return 'windows';
+		case 'linux':
+			return 'linux';
+		default:
+			throw new Error('Unknown platform ' + arch);
 	}
 }
 
-function cacheDir(opts = {}) {
-	var homeDir = homePath();
-	return opts.cache || path.join(homeDir, './.libui');
-}
-
-async function mkCacheDir(cache) {
-	try {
-		await mkdir(cache);
-		return cache;
-	} catch (err) {
-		if (err.code !== 'EACCES') {
-			debug('mkCacheDir error: ', err.stack);
-			throw err;
-		}
-
-		// try local folder if homedir is off limits (e.g. some linuxes return '/' as homedir)
-		var localCache = path.resolve('./.libui');
-
-		await mkdir(localCache);
-		return localCache;
-	}
-}
-
-function buildUrl(opts, filename) {
-	var url = process.env.NPM_CONFIG_LIBUI_MIRROR ||
-		process.env.LIBUI_MIRROR ||
-		opts.mirror ||
-		'https://github.com/parro-it/libui/releases/download/';
-
-	url += process.env.LIBUI_CUSTOM_DIR || opts.customDir || opts.version;
-	url += '/';
-	url += process.env.LIBUI_CUSTOM_FILENAME || opts.customFilename || filename;
-	return url;
-}
-
-async function download(opts) {
+function download(opts) {
 	const platform = nodePlatformToOS(opts.platform || os.platform());
 	const arch = opts.arch || os.arch();
 	const version = opts.version;
 	const symbols = opts.symbols || false;
-	const filename = 'libui-shared-' + platform + '-' + arch + '-' + version + (symbols ? '-symbols' : '') + '.tar.gz';
+	const filename = 'libui-shared-' + platform + '-' + arch + '-' + version +
+					 (symbols ? '-symbols' : '') + '.tar.gz';
 
 	if (!version) {
 		throw new Error('must specify needed version of libui in package.json');
 	}
 	const url = buildUrl(opts, filename);
 	const cache = cacheDir(opts.cache);
-	const actualCache = await mkCacheDir(cache);
+	const actualCache = mkCacheDir(cache);
 
 	debug('info', {cache: cache, filename: filename, url: url});
 
 	let cachedZip = path.join(cache, filename);
-	const exists = await pathExists(cachedZip);
+	const exists = fs.existsSync(cachedZip);
 
 	if (exists) {
 		debug('zip exists', cachedZip);
-		return cachedZip;
+		return Promise.resolve(cachedZip);
 	}
 
 	debug('creating cache/tmp dirs');
@@ -92,56 +53,34 @@ async function download(opts) {
 	cachedZip = path.join(actualCache, filename); // in case cache dir changed
 
 	// download to tmpdir
-	var tmpdir = path.join(
-		os.tmpdir(),
-		'libui-tmp-download-' + process.pid + '-' + Date.now()
-	);
+	var tmpdir =
+		path.join(os.tmpdir(), 'libui-tmp-download-' + process.pid + '-' + Date.now());
 
-	await mkdir(tmpdir);
+	mkdirp.sync(tmpdir);
 	debug(tmpdir + 'created');
 
 	debug('downloading zip', url, 'to', tmpdir);
 
 	const target = path.join(tmpdir, filename);
 
-	const resRedirect = await requestHttps(url);
-	if (resRedirect.statusCode !== 302) {
-		throw new Error(`Https request failed for ${url} with code ${resRedirect.statusCode}: resource not found.`);
-	}
-
-
-	const res = await requestHttps(resRedirect.headers.location);
-	if (res.statusCode !== 200) {
-		throw new Error(`Https request failed for ${res.headers.location} with code ${res.statusCode}.`);
-	}
-
-	debug(`Https request for ${url} ok with code 200.`);
-
-	const fileWrite = res.pipe(fs.createWriteStream(target));
-
-	return await new Promise(async(resolve, reject) => {
-
-		const finish = () => {
-			debug('end stream reached', target, cachedZip);
-			mv(target, cachedZip, function (err) {
-				if (err) {
-					reject(err);
-				} else {
-					resolve(cachedZip);
-				}
-			});
-		};
-
-		fileWrite.on('finish', finish);
-		fileWrite.on('error', reject);
-	});
+	return requestHttps(url)
+		.then(resRedirect => {
+			if (resRedirect.statusCode !== 302) {
+				throw new Error(`Https request failed for ${url} with code ${
+					resRedirect.statusCode}: resource not found.`);
+			}
+			return resRedirect;
+		})
+		.then(resRedirect => requestHttps(resRedirect.headers.location))
+		.then(res => doDownload(res, url, target, cachedZip))
 }
 
-async function main() {
-	const zipPath = await download({version: process.env.npm_package_libui});
-	console.log('Downloaded zip:', zipPath);
-	await tar.extract({file: zipPath});
-	console.log('Libui binaries extracted to:', process.cwd());
+function main() {
+	return download({version: process.env.npm_package_libui}).then(zipPath => {
+		console.log('Downloaded zip:', zipPath);
+		tar.extract({file: zipPath, sync: true});
+		console.log('Libui binaries extracted to:', process.cwd());
+	});
 }
 
 main().catch(err => {
diff --git a/tools/libui-napi-download.js b/tools/libui-napi-download.js
index 3fe7809..9abc59d 100644
--- a/tools/libui-napi-download.js
+++ b/tools/libui-napi-download.js
@@ -2,68 +2,28 @@ const fs = require('fs');
 const os = require('os');
 const path = require('path');
 const mkdirp = require('mkdirp');
-const homePath = require('home-path');
-const mv = require('mv');
 const _debug = require('debug');
-const https = require('https');
 const tar = require('tar');
-const utils = require('util');
 const isCI = require('is-ci');
+const {mkCacheDir, cacheDir, buildUrl, requestHttps, doDownload} =
+	require('./lib')('libui-napi');
 
-const mkdir = utils.promisify(mkdirp)
 const debug = _debug('libui-napi-download');
-const requestHttps = url => new Promise((resolve, reject) => {
-	const req = https.get(url, resolve);
-	req.on('error', reject);
-});
-
-const pathExists = utils.promisify(fs.exists);
 
 function nodePlatformToOS(arch) {
 	switch (arch) {
-		case 'darwin': return 'osx';
-		case 'win32': return 'win';
-		case 'linux': return 'linux';
-		default: throw new Error('Unknown platform ' + arch);
-	}
-}
-
-function cacheDir(opts = {}) {
-	var homeDir = homePath();
-	return opts.cache || path.join(homeDir, './.libui-napi');
-}
-
-async function mkCacheDir(cache) {
-	try {
-		await mkdir(cache);
-		return cache;
-	} catch (err) {
-		if (err.code !== 'EACCES') {
-			debug('mkCacheDir error: ', err.stack);
-			throw err;
-		}
-
-		// try local folder if homedir is off limits (e.g. some linuxes return '/' as homedir)
-		var localCache = path.resolve('./.libui-napi');
-
-		await mkdir(localCache);
-		return localCache;
+		case 'darwin':
+			return 'osx';
+		case 'win32':
+			return 'win';
+		case 'linux':
+			return 'linux';
+		default:
+			throw new Error('Unknown platform ' + arch);
 	}
 }
 
-function buildUrl(opts, filename) {
-	var url = process.env.NPM_CONFIG_LIBUI_MIRROR ||
-		process.env.LIBUI_MIRROR ||
-		opts.mirror ||
-		'https://github.com/parro-it/libui-napi/releases/download/';
-
-	url += process.env.LIBUI_CUSTOM_DIR || opts.customDir || opts.version;
-	url += '/';
-	url += process.env.LIBUI_CUSTOM_FILENAME || opts.customFilename || filename;
-	return url;
-}
-
-async function download(opts) {
+function download(opts) {
 	const platform = nodePlatformToOS(opts.platform || os.platform());
 	let arch = opts.arch || os.arch();
 	if (platform !== 'win' && arch === 'x64') {
@@ -77,16 +37,16 @@ async function download(opts) {
 
 	const url = buildUrl(opts, filename);
 	const cache = cacheDir(opts.cache);
-	const actualCache = await mkCacheDir(cache);
+	const actualCache = mkCacheDir(cache);
 
 	debug('info', {cache: cache, filename: filename, url: url});
 
 	let cachedZip = path.join(cache, filename);
-	const exists = await pathExists(cachedZip);
+	const exists = fs.existsSync(cachedZip);
 
 	if (exists) {
 		debug('zip exists', cachedZip);
-		return cachedZip;
+		return Promise.resolve(cachedZip);
 	}
 
 	debug('creating cache/tmp dirs');
@@ -95,66 +55,43 @@ async function download(opts) {
 	cachedZip = path.join(actualCache, filename); // in case cache dir changed
 
 	// download to tmpdir
-	var tmpdir = path.join(
-		os.tmpdir(),
-		'libui-napi-tmp-download-' + process.pid + '-' + Date.now()
-	);
+	var tmpdir = path.join(os.tmpdir(),
+						   'libui-napi-tmp-download-' + process.pid + '-' + Date.now());
 
-	await mkdir(tmpdir);
+	mkdirp.sync(tmpdir);
 	debug(tmpdir + 'created');
 
 	debug('downloading zip', url, 'to', tmpdir);
 
 	const target = path.join(tmpdir, filename);
 
-	const resRedirect = await requestHttps(url);
-	if (resRedirect.statusCode === 404) {
-		throw new Error(`Prebuilt binaries not found for your platform and architecture.`);
-	}
-
-	if (resRedirect.statusCode !== 302) {
-		throw new Error(`Https request failed for ${url} with code ${resRedirect.statusCode}: resource not found.`);
-	}
-
-
-	const res = await requestHttps(resRedirect.headers.location);
-	if (res.statusCode !== 200) {
-		throw new Error(`Https request failed for ${res.headers.location} with code ${res.statusCode}.`);
-	}
-
-	debug(`Https request for ${url} ok with code 200.`);
-
-	const fileWrite = res.pipe(fs.createWriteStream(target));
-
-	return new Promise(async(resolve, reject) => {
-
-		const finish = () => {
-			debug('end stream reached', target, cachedZip);
-			mv(target, cachedZip, function (err) {
-				if (err) {
-					reject(err);
-				} else {
-					resolve(cachedZip);
-				}
-			});
-		};
-
-		fileWrite.on('finish', finish);
-		fileWrite.on('error', reject);
-	});
+	return requestHttps(url)
+		.then(resRedirect => {
+			if (resRedirect.statusCode === 404) {
+				throw new Error(
+					`Prebuilt binaries not found for your platform and architecture.`);
+			}
+			if (resRedirect.statusCode !== 302) {
+				throw new Error(`Https request failed for ${url} with code ${
+					resRedirect.statusCode}: resource not found.`);
+			}
+			return resRedirect;
+		})
+		.then(resRedirect => requestHttps(resRedirect.headers.location))
+		.then(res => doDownload(res, url, target, cachedZip))
 }
 
-async function main() {
-
+function main() {
 	if (isCI) {
 		console.log('Running on a CI server, force rebuild.');
 		process.exit(1);
 	}
 
-	const zipPath = await download({version: process.env.npm_package_version});
-	console.log('Downloaded zip:', zipPath);
-	await tar.extract({file: zipPath});
-	console.log('Libui-napi binaries extracted to:', process.cwd());
+	return download({version: process.env.npm_package_version}).then(zipPath => {
+		console.log('Downloaded zip:', zipPath);
+		tar.extract({file: zipPath, sync: true});
+		console.log('Libui-napi binaries extracted to:', process.cwd());
+	});
 }
 
 main().catch(err => {