As of 2026, Trimble (the developer) only provides official downloads for the last two major versions
: Unlike current versions, this allows you to work offline without a browser.
The most reliable way to download SketchUp 2017 is from the official Trimble website. Trimble is the company that owns SketchUp.
: Once the 30 days expire, the software should automatically revert to the permanent "Make" (free) version for personal, non-commercial use.