First, You need to open a PWSH session. If PS 7 is still in preview:
pwsh-preview
otherwise:
pwsh
Next, execute this script with your desired parameters:
.\Find-BlueKeepVulnerableComputers.ps1 -Verbose -RDPScanEXE "C:\Users\Bob\Downloads\rdpscan-windows-3\rdpscan.exe" -Collections "All Computers" -MaxJobs 64
If you want to see all of the parameters:
Get-Help .\Find-BlueKeepVulnerableComputers.ps1
You can go pretty high with -MaxJobs if you have enough RAM. -MaxJobs 128 used about 1.2 GB on my computer. Your mileage may vary.
This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.