SketchUp cannot start due to a license error.
That problem would show on Windows, in SketchUp 2019 and early 2020 versions. Your profile says you are using Mac 2021 version, did you see that error on Mac? If so, can you show a screenshot of the error, and say exactly at what point it happens?
If you really saw the error on Windows, make sure you are using 2020.2 or later.