IcingaForWindows.ps1 - Problems with $env:temp

[Fail-Unsafe]

I'm trying to install the Icinga Framework for Windows using the script IcingaForWindows.ps1.

However it seems to use the variable $env:temp everywhere to write temporary files in to the user's temp directory.

This causes problems on our systems as the usernames seem to be garbled up by Powershell, e.g. the username t.bruns-t2 becomes C:\Users\T6CBA~1.BRU\AppData\Local\Temp and this causes problems like this one:

Remove-Item : An object at the specified path C:\Users\T6CBA~1.BRU does not exist.

This is probably because of PowerShell/PowerShell#17359 (comment)

Is there a way to consistently use a well-known directory like C:\Windows\Temp?