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?

[LordHepipud]

This is a very interesting issue and I guess won't even be fixed for PowerShell 5 anymore.
I really don't like writing data into the Windows temp folder, just because no third party tool - in my opinion - should ever require access to this folder.

Using the current user environment also ensures that "hijacking" an installation process on the machine is more difficult.

We could use the Public user and write temporary files there, but this also seems like weird workaround.

Just out of curiosity: Does the installation itself work and just the later cleanup of the temp files is causing issues or does the entire installation fail?

Because if simply the clean-up fails, I wouldn't want to create workarounds for this.