I had a problem with a Mac OS X 10.7 VM I was using with Parallels Desktop 11 on my Mac. Several applications I had installed in it were highly customised, so I decide to restore a backup of the VM from around 8 months ago. I restored the backup but Parallels refused to open it saying it was from a different version of Parallels. Is there some way I can just update the VM? Surely when I installed the Parallels Desktop 11 Application upgrade it updated my VMs then?