This may help
To de-activate a license, type this in on the computer being de-activated:
prlsrvctl deactivate-license
Obviously this won't work if you no longer have the computer in question. I think if you don't have the original computer you'll need to contact Parallels support for...
Unable to de-activate old install and activate new install
We're using Parallels Desktop 9 Enterprise and want to remove Parallels from one of our machines and put it on another machine. I followed the directions to uninstall it on the old machine but when I install it on the new machine and...
