cracked versions are bad really bad
they are so bad that they look like Cartman on my avatar...
but i will answer to your question for the freeware vsts that you might have....
cubase no it's not the only program... you can use them from fl studio, abelton live, nuendo etc...
but if you really want to use them with reason all you have to do is rewire reason with you cubase
peace man...