Hi kruupy,
First you need to add yourself as the owner to the “WindowsApps” folder and inherit that to all sub-folders. Therefore make sure to tick “inherit to sub-folders” once you have added your user as the owner. This inheritance option does only appear on the security tab after adding yourself.
At first it wouldn’t let me delete the folder mentioned above either. Clicking “retry” then did the trick eventually. If that still does not work however, you may be able to delete it with an elevated explorer.exe process.
Please refer to these guides if you do not know how to change file / folder permissions on Windows:
- https://www.windowscentral.com/how-take-ownership-files-and-folders-windows-10
- https://docs.microsoft.com/en-us/windows/security/identity-protection/access-control/access-control
Let me know if this works for you.