You may be finding errors or bugsplats in SketchUp and been asked to perform a 'Clean' uninstall. This process removes more that just the application and includes some hidden files so take note of what plugins are downloaded as the plugins will be removed.
The process is very similar for most SketchUp versions on MacOS just replace the number or # with the year you need to uninstall. If you need to do this on a Windows machine, please see
this article.