Triebwerk Soundset Activation Problems

Having purchase and licensed this soundset, I was happy enough with it to start producing some work. Other factors required that I roll my system back using disaster recovery software (true image) to bring me back to pre install of Triebwerk and now when I launch Cubase, it reports that the soundset cannot be found or that the license is invalid. Triebwerk does NOT show up in eLicnesor! Trying to activate in eLicensor results in the message 'already activated or can only be activated once! Any ideas anyone?