I saw that you noticed the other topic, where someone with LayOut 2021 had the same issue. It would be worth you renaming the %appdata%\SketchUp\SketchUp 2020 folder to something different, then see if LayOut 2020 works ok.
Select the textstring of the location, rightclick on it and choose: advanced > open in finder
Or copy and in Finder select Go > Go to folder and paste it.
It’s a ‘hidden’ folder.
So, it was late, and I didn’t allow for you being on Mac and not Windows like the other person!
The equivalent idea for Mac would be to go into this folder:
~/Library/Application Support/
You can get there by copying that text, and in Finder’s Go menu, choose Go to Folder… Paste in the text, and Go there. Then, rename the SketchUp 2020 folder to be something else, and reopen LayOut. The folder will be recreated, and LayOut may well work.