If you are searching for this specific legacy version, here is what you need to know about its current availability and risks:
: Integrated features like the 3D Warehouse and Extension Warehouse no longer support SketchUp 2017, making it difficult to download pre-made models or add-ons directly within the software. Key Features of the 2017 Version
: Trimble has removed the download links for SketchUp 2017 (including the free "Make" version) from their official site. They only offer downloads for the two most recent major versions of SketchUp Pro.