My rhino 7 evaluation license suddenly expired before date. I can’t open the files which I was working on with. How can I solve this problem?
That’s not quite true.
You started your 90-days trial on December 17th 2020 and that period ended on March 17th this year.
You managed to get around the system by using many different eMail addresses but that is not allowed. A person can only have one single trial period.
You can still open files with an expired license. You can’t save any changes.
You can buy a license. See Rhino - Buy - Rhinoceros for more information.