No. Extensions are version-specific. Look for extensions that support "SketchUp 2017" (usually versions released between 2016–2019). V-Ray 3.6 works perfectly.
Yes – with caveats.
If you are a student, a hobbyist woodworker, or a retired architect designing your dream shed, the verified SketchUp 2017 free version is the best 3D software ever released. It is stable, powerful, and respects your ownership of your computer. sketchup 2017 free version verified
If you are a professional collaborating with engineers or rendering in the cloud, buy the subscription. You need .SKP version parity. a hobbyist woodworker
Look for a post by a "SketchUp Team" member or a long-term moderator (e.g., Dave R, Anssi). Often, they post a direct link to Trimble’s downloads.trimble.com domain. sketchup 2017 free version verified