My question is: Why even buy it if you get a free trial?
Sounds like the winzip method here.... winzip had a free trial that many people used beyond the trial terms.
While it would probably work to use the trial to create a restore image, use of applying the restore image beyond say the 14 days would require .... cant state the trick here
... but if no orphan registry entries are left behind from it to prevent what I cant state here, it could be used for free once or twice a year as a system recovery back to image is needed etc. I havent tried this trick with true image that I cant state here to know if it protects itself against such tricks.