[SoleilAbsolu]

Also - regarding linked article's statement "PowerShell joins MSI files as another type that cannot be run as an administrator" - I have always just started a PowerShell/Terminal app as administrator which has more or less the same effect, though of course everything in that session is run with elevated permissions.

[steve1977]

I don't even fully understand what the article means with that regarding MSI.

Windows Installer will elevate automatically (i.e. prompt with UAC if needed) if you're administrator. Or you as you say you open a command prompt as administrator and run the MSI with msiexec.