Did not know that but it won`t help me anyway because we are working on them (Prime) on the university and we (me and colleague) should have done it during the classes. He had installed the trial for MC 15 on his computer so we could make the homework but still we need the file for prime. I have used trials for prime and MC 15 in the past. However I am not sure if on the uni computers are MC 15 as well and I guess I won`t be able to install it.
I assume I have no choice to ask someone to convert the file, but thanks anyway.