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FIXED: Discord Install Failed: Can't find PresentationCore 4.0.0.0

Fixed: Can't find PresentationCore 4.0.0.0

Update: 4/11/2023 - I finally fixed this error.  The final fix was updating .NET framework to version 4.8.1 (which I got from here).  As of 4/11 the recommended version is 4.8, but multiple uninstall and reinstall of that version had no change in the error on install.  However, on a lark I tried the most recent version 4.8.1 even though it is not recommended a voila; problem solved!

Original post

Note: I have a support case open with Discord but no resolution yet. Figured I'd post here as well and also on Reddit.

History of issue:

• One day Discord stopped opening; click icon and nothing opens - no process started that I could see in Task Manager
• Figured I'd uninstall and reinstall.
• Used Windows uninstall; would click uninstall and nothing would happen.
• Ended up downloading Revo Uninstaller to uninstall which was successful
• After uninstall I am now unable to install

What I've tried

• Tried all steps for a corrupt install: https://support.discord.com/hc/en-us/articles/115004307527--Windows-Corrupt-Installation
• Tried installing the Canary client; still errors
• I also unpacked the DiscordSetup.exe with 7zip, copied to my root folder, and then extracted and ran the files inside (I followed guidance on YouTube but lost the video link)
• This at least causes the Discord opening screen to show up, but then it fails to a JavaScript error noted in this Screenshot https://imgur.com/lSFtVuO

What is happening?

All installs fail and generate a log and in that log everytime is a failure noting something in regards to being unable to find something called PresentationCore (assumed to be a DLL; part of Microsoft .NET)

Unhandled exception: System.IO.FileNotFoundException: Could not load file or assembly 'PresentationCore, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35' or one of its dependencies. The system cannot find the file specified.
File name: 'PresentationCore, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35'
   at Squirrel.Update.Program.executeCommandLine(String[] args)
   at Squirrel.Update.Program.main(String[] args)

I have verified PresentationCore.DLL is in the correct folders. I have used Microsoft's .NET framework repair tool.

As a note I went into Windows > Assembly folder and I see PresentationCore listed twice - both as version 3.0.0.0. It seems like I am missing version 4.0.0.0 but no real idea, even after a ton of googling, how to get 4.0.0.0 to show up in assembly.

Appreciative of any ideas anyone has while I also work with Discord support.