For years, this bug exists on Mac with case sensitive filesystem. Thousands of topics on forums with no solution. Only solution - reinstall Your Mac OS with case insensitive filesystem. Nice, thank You. That’s what I dreamed about.
Here is solution: Guide: How to run Steam when your macOS drive is case-sensitive
Just replace steam with sketchup 
If You have existing installation, just move ~/Library/Application Support/SketchUp* to Library folder You created on image and make symlinks back to Application Support folder.
Hope this will help.
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Why not clone the whole disc and format it right? Does Unix still exists?
Well, I feel much comfortable with case sensitive filesystem, which is normal for any *nix os. Reformatting/cloning/moving/reinstalling - this is not what I want to do with my Mac just because one app doesn’t work right. To be honest, I think this bug have to be fixed years ago in app, instead offering to fix my Mac.
Yes, unix still exists and feels very well
Thank you very much for sharing this solution! It worked like a charm 
This information should be included on official installation documentation!