I do have a SketchUp pro 2019 Subscription License,can I use the same on the 2017 version?Or will have to purchase a different license for the 2017
Licenses are version-specific. I’m not sure they’d sell you a license for SketchUp 2017 at this point. Why would you want a license for that old version now?
The SketchUp Pro Subscription licenses allows access to both version 2019 and 2020. It’s worth noting that each version will consume 1 of the 2 activations you are allowed.
So lets say that you have both 2019 and 2020 installed on your work computer Then you would not be able to use the license on a separate laptop or home computer.