LimeLM Problem when updating Paralells

One of my users installed and activated my software in a VM copy of Windows 7 on Parallels, using LimeLM. They later performed an update to Parallels Version 10.1.3 (28868) and attempted to re-activate using the same product key, but was informed the "product key was already in use" - I suspect the upgrade resulted in a new hardware fingerprint for the VM.

I provided the user with a new product key, but this may occur again for future system updates. How can I address this?

I suspect the upgrade resulted in a new hardware fingerprint for the VM.

It seems that Parallels changed the fingerprint of the "computer". That's not unusual. It's just another reason to use floating licensing when customer install your app on VMs.