Rhino Trial to Licence

I’ve been using the Rhino trial version for the last few months, and my trial licence expired. I have recently joined a class about using Rhino, and we are using the Zoo in this class, Is there a way for me to save my leftover trial version files? The projects are open, but will not save (as they were made when the trial licence expired, and before I stared using the Zoo). Is there a way for me to save these files?
Note- I have tried opening the licence manager on the trial version, but it does not open.

Sorry, no. It’s not possible.
Any data created after the evaluation expired can not be saved.