I just purchased a new license (2016, since it didn’t give me any other option) and I’m trying to add a license to Sketchup Pro 2015. Yes, I intentionally want to use 2015 and not 2016, since all other people that use the files I’m working on are using 2015 and are not upgrading at the moment. How can I use my new license to access Sketchup Pro 2015? I’ve tried to enter my serial number and authorization code, but it’s “invalid”.
Help!