Getting a direct, official "portable" version of Google SketchUp 8 is tricky because Trimble (the current owner) no longer officially supports or distributes this 2010-era software.
Since it hasn't been updated in over a decade, it lacks modern security patches. Compatibility Issues:
There is a certain nostalgia surrounding . Before Trimble bought the software and turned it into a subscription service, Google offered a free desktop version that put 3D modeling into the hands of hobbyists, woodworkers, and architecture students.
Always scan any downloaded executable with an updated antivirus. When in doubt, use the free, web-based SketchUp Free on a modern browser. But for those who value offline portability above all else, Google SketchUp 8 remains an undefeated champion.
If you search for "Google SketchUp 8 Portable free download" on Google or torrent sites, you will find dozens of results.