Do not use third-party sites. Go to forums.sketchup.com . Search for "SketchUp Make 2017 download link."

“You can just download it from sketchup.com now.” Truth: Trimble’s current download page offers only SketchUp Pro trial (30 days) and the web version. The Make 2017 installer is no longer directly linked.

Unlike the current web-based free version, SketchUp Make 2017 offers:

Look for the Trimble/SketchUp "Older Versions" help page first.