Have any of you just tried the latest version (3.8.5 beta) and see if it works for you?
There are 454 differences between 3.8.4 and the 3.8.5 beta.
and 30+ of them are to the Show-InstallationRestartPrompt function.
EDIT: Any Estimated date for 3.8.5 or 4/0?
TL;DR: 3.8.5 is coming out in 2-3 weeks!