[Unable to uninstall or upgrade from 4.3.10: missing MSI file and windows repair tool doesn't help]

That's the one I've tried, several times, and it doesn't find anything to fix. 

[Unable to uninstall or upgrade from 4.3.10: missing MSI file and windows repair tool doesn't help]

When I try to uninstall or upgrade Paint.NET I get a box saying 

Quote

The feature you are trying to use is on a network resource that is unavailable. 
Click OK to try again, or enter an alternate path to a folder containing the installation package 'PaintDotNet_x64_243667732.msi' in the box below.
Use source:
C:\Program Files\paint.net\Staging\

 

I've tried using the windows troubleshooter from here but that didn't find anything to fix. "Troubleshooter couldn't identify the problem". 

 

Is it possible to get the old installer msi? Perhaps that'll help windows/paint.net do an uninstall. If not, any other tips? 

 

I'm on Windows 11 Pro 10.0.22621.

 

thanks,

Rory