For those of you running Windows 10/11 and bought the program using the Microsoft Store.
Here is a solution. Again, not advised, but it worked for me.
1. Enable the option to open explorer in a separate process
2. Install the "Get ownership" context menu
3. Open your CMD as an administrator
4. Go to the WindowsApps folder of your application
>> Hang on, we are halfway there! 😁
5. Now the "Take Ownership" of the Designer/Photo/Publisher.exe.config
6. Open the file with notepad or other program and make the changes suggested by @lacerto
7. Save the file and you are done! 👏 👏
Common errors
Hope this helps someone, and you don't need to waste 4 hours searching and combining solutions from random places on the internet. 😅