I download the demo version to try it and then played with my system clock. That action lock the demo and i gut now a system error to contact you. what should i do so i can learn on your system?

I had the same problem too. This is what to do:

-Visit the support web page at www.christiansteven.com.
-Register for support.
-They will send you a customer number.
-Then use this customer number to log a support call explaining the problem.
-They will send you a code and instructions which will release the program.