Google Sketchup 8 Portable Free Hot! Download Link
The answer depends on your needs.
While SketchUp 8 (released in 2010) is now considered abandonware (no longer supported by Trimble, the current owner), downloading a "Portable" version from unofficial sources comes with significant trade-offs. google sketchup 8 portable free download
or sandbox to run the software if you are unsure of its origin. The answer depends on your needs