I've attempted this with a copy of Buildbox 3 Beta of my own, but when I tried to input the license key, an error message told me that wasn't the correct key for it. Well, obviously, something happened, because when I opened up Buildbox later, there were obviously new templates especially for 3d, well, when I tired one of those, my entire program crashed, and because I found out I couldn't really use it anymore, I had to reinstall Buildbox entirely and start from scratch. (I actually had to remove the initial project because I couldn't even open it because of it "claiming" it to be from the "newer" version of the program, just as a side note.) Obviously, the title is self-explanatory, and obviously I need help with that. Thanks anyway.
Contact the technical support service to reset your license. You can access your BB account and verify your license number for BB3. https://www.buildbox.com/account/