I can’t find a source
Sketchucation is the source.
It doesn’t work with SketchUp for Schools, though. That’s a web based version for school children. Please fix your forum profile. There is no SketchUp version called “interior design” and there’s no Mac OS version 21 and you did not list the graphics card where you were asked to supply that information.
Are you actually using a cracked version of SketchUp 2021?