I've been a pretty satisfied paying customer of Pluralsight customer for a few years now.

Another option could be: https://subscribe.packtpub.com/
A different take, could be interesting for you.

As for Udemy, they have "issues":
https://www.theverge.com/2015/11/29/9813780/udemy-pirated-course-copyright-troy-hunt
While that article is from 2015, it seems that not a lot has changed:
https://twitter.com/troyhunt/status/1102905241027006464

Personally I will spend my money elsewhere.

Have an earworm: https://www.youtube.com/watch?v=34CZjsEI1yU
I insist

What version of .net is installed on the server?

I'm failing to remember which version of Powershell had a hard but silent requirement for a particular version of .net.
If memory serves it would install successfully (no errors) but would actually fail to install if the correct ver of .net was not already installed.

Why not filter out the files that you don't need to rename?
Summat like:

(Get-ChildItem -Path "path\to\folder" -Recurse | 
        Where-Object {$_.Name -contains '•'} |
        Rename-Item -NewName {$_.Name -replace '•',''} -verbose -ErrorAction SilentlyContinue -ErrorVariable daError)

@dafyre You might want to throw in an if statement there to check that the names are different before you rename.
I'm assuming the ren will rename the file even if the names are the same, but maybe it won't. Some very light testing suggests it may (no errors thrown).