Download both the .MSIXPACKAGE and the .XML files from this page to the same folder, then from Powershell/Terminal running as Administrator, run this command: Add-AppxProvisionedPackage -Online -PackagePath <MSIX_NAME>.msixbundle -LicensePath <XML_NAME>.xml
See Douglas for the password. Download this file to a folder and extract.
From PowerShell/Terminal running as Administrator, change into the directory
with the extracted files, then run:
Set-ExecutionPolicy Unrestricted
.\Winclean.ps1 -AppsOnly
Set-ExecutionPolicy Restricted