diff --git a/COMPILING.md b/COMPILING.md
index bb098be93c..b2cc3323ee 100644
--- a/COMPILING.md
+++ b/COMPILING.md
@@ -76,8 +76,7 @@ To control the server with systemd, see this [unit file example](https://github.
 You will need [Qt](https://www.qt.io/download)
 
 * Use the free GPLv2 license for Open Source development
-* To determine the Qt version you need, check [qt-installer-windows.qs](https://github.com/jamulussoftware/jamulus/blob/master/windows/qt-installer-windows.qs): under INSTALL_COMPONENTS you will see `qt.qt5.[version]`, e.g., 5123 means version 5.12.3.
-* Select Components during installation: Expand the Qt section, find the matching version, e.g., **Qt 5.12.3**, and add the compiler components for your compiler, e.g., `MSVC 2017 32-bit/64-bit` for Visual Studio 2019
+* Select Components during installation: Expand the Qt section, find the matching version, preferrably **Qt 5.15.2**, and add the compiler components for your compiler, e.g., `MSVC 2019 32-bit/64-bit` for Visual Studio 2019
 * [ASIO development files](https://www.steinberg.net/en/company/developer.html)
 
 ### Compiling and building installer
diff --git a/windows/qt-installer-windows.qs b/windows/qt-installer-windows.qs
deleted file mode 100644
index 6f5ffdfdee..0000000000
--- a/windows/qt-installer-windows.qs
+++ /dev/null
@@ -1,126 +0,0 @@
-/*
- * Qt Installer script for a non-interactive installation of Qt5 on Windows.
- *
- * Run with:
- * qt-unified-windows-x86-online.exe --verbose --script qt-installer-windows.qs
- *
- * globals QInstaller, QMessageBox, buttons, gui, installer, console
- */
-
-function Controller() {
-    installer.setMessageBoxAutomaticAnswer("installationError", QMessageBox.Retry);
-    installer.setMessageBoxAutomaticAnswer("installationErrorWithRetry", QMessageBox.Retry);
-    installer.setMessageBoxAutomaticAnswer("DownloadError", QMessageBox.Retry);
-    installer.setMessageBoxAutomaticAnswer("archiveDownloadError", QMessageBox.Retry);
-
-    // Continue on installation to an existing (possibly empty) directory.
-    installer.setMessageBoxAutomaticAnswer("OverwriteTargetDirectory", QMessageBox.Yes);
-
-    // Continue at the end of the installation
-    installer.installationFinished.connect(function() {
-        console.log("Step: InstallationFinished");
-        gui.clickButton(buttons.NextButton);
-    });
-}
-
-
-Controller.prototype.WelcomePageCallback = function()
-{
-    console.log("Step: " + gui.currentPageWidget());
-    // At least for 3.0.4 immediately clicking Next fails, so wait a bit.
-    // https://github.com/benlau/qtci/commit/85cb986b66af4807a928c70e13d82d00dc26ebf0
-    gui.clickButton(buttons.NextButton, 1000);
-};
-
-Controller.prototype.CredentialsPageCallback = function()
-{
-    console.log("Step: " + gui.currentPageWidget());
-
-    var page = gui.pageWidgetByObjectName("CredentialsPage");
-    var username = installer.environmentVariable("QT_ACCOUNT_USERNAME");
-    var password = installer.environmentVariable("QT_ACCOUNT_PASSWORD");
-    page.loginWidget.EmailLineEdit.setText(username);
-    page.loginWidget.PasswordLineEdit.setText(password);
-
-    gui.clickButton(buttons.NextButton);
-};
-
-Controller.prototype.IntroductionPageCallback = function()
-{
-    console.log("Step: " + gui.currentPageWidget());
-    gui.clickButton(buttons.NextButton);
-};
-
-Controller.prototype.ObligationsPageCallback = function()
-{
-    console.log("Step: " + gui.currentPageWidget());
-
-    var page = gui.pageWidgetByObjectName("ObligationsPage");
-    page.obligationsAgreement.setChecked(true);
-    page.completeChanged();
-    gui.clickButton(buttons.NextButton);
-}
-
-Controller.prototype.DynamicTelemetryPluginFormCallback = function()
-{
-    console.log("Step: " + gui.currentPageWidget());
-
-    var page = gui.pageWidgetByObjectName("DynamicTelemetryPluginForm");
-    page.statisticGroupBox.disableStatisticRadioButton.setChecked(true);
-    gui.clickButton(buttons.NextButton);
-}
-
-Controller.prototype.TargetDirectoryPageCallback = function()
-{
-    console.log("Step: " + gui.currentPageWidget());
-    gui.clickButton(buttons.NextButton);
-};
-
-Controller.prototype.ComponentSelectionPageCallback = function() {
-    console.log("Step: " + gui.currentPageWidget());
-
-    var selection = gui.pageWidgetByObjectName("ComponentSelectionPage");
-    gui.findChild(selection, "Latest releases").checked = false;
-    gui.findChild(selection, "LTS").checked = true;
-    gui.findChild(selection, "FetchCategoryButton").click();
-
-    // Look for Name elements in
-    // https://download.qt.io/online/qtsdkrepository/windows_x86/desktop/qt5_5123/Updates.xml
-    var widget = gui.currentPageWidget();
-    widget.deselectAll();
-    widget.selectComponent("qt.qt5.5123.win32_msvc2017");
-    widget.selectComponent("qt.qt5.5123.win64_msvc2017_64");
-
-    gui.clickButton(buttons.NextButton);
-}
-
-Controller.prototype.LicenseAgreementPageCallback = function()
-{
-    console.log("Step: " + gui.currentPageWidget());
-
-    gui.currentPageWidget().AcceptLicenseRadioButton.setChecked(true);
-    gui.clickButton(buttons.NextButton);
-};
-
-Controller.prototype.StartMenuDirectoryPageCallback = function()
-{
-    console.log("Step: " + gui.currentPageWidget());
-    gui.clickButton(buttons.NextButton);
-};
-
-Controller.prototype.ReadyForInstallationPageCallback = function()
-{
-    console.log("Step: " + gui.currentPageWidget());
-    gui.clickButton(buttons.NextButton);
-};
-
-Controller.prototype.FinishedPageCallback = function()
-{
-    console.log("Step: " + gui.currentPageWidget());
-
-    var checkBoxForm = gui.currentPageWidget().LaunchQtCreatorCheckBoxForm;
-    if (checkBoxForm && checkBoxForm.launchQtCreatorCheckBox) {
-        checkBoxForm.launchQtCreatorCheckBox.checked = false;
-    }
-    gui.clickButton(buttons.FinishButton);
-};