You can not use your Forex Tester 3 key to register Forex Tester 2 and vice versa.

If you have Forex Tester 2 license, you can buy upgrade for a small fee.

You can buy Forex Tester 3 and we will provide Forex Tester 2 key for free (we do not sell FT2 anymore).

We’ve released 19 features that will speed up your strategy testing, please scroll down the page  www.forextester.com/ft3 to read more about the update.