I recommend try the demo before buy this product. Firstly you can try on a workflow. Also you can make decision about upgrading your PC. Yes. Fountain animation eats a lot of PC resources!
The demo version have short list of features. Full list only for commercial version.
The demo key valid for 8 days. You can get no more two keys for a one email address. Two keys quite enough to try the demo and make decision.
The license key
The license key (as well as the demo key) can be used by only one PC.
But you can run any count of 3ds max at the same time.
Your local date and time must be correct. In other cases FTools.script can work incorrect. The key will be corrupted.