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Hi Paul,
First read this:https://community.ptc.com/t5/Mathcad-Tips/Official-PTC-Mathcad-15-and-Prime-1-6-End-of-Sale-Announcement/ta-p/818870
Considering you do have a license file, you may stand a chance if you can make your virtual box mimic the MAC address of the PC originally used for the license. If you're lucky the MAC address that the license responds to, is stated in the license file...
If that fails, you are at the mercy of PTC.
Realise that is forum is for interaction between users of the software; your peer users cannot help you with your problem. You need to contact PTC support.
Success!
Luc
