You could always try port forwarding stuff properly so you don't even need hamachi.
#1: warez/cracks/serials aren't allowed on epvp.. plus I'm not sure that you can even get them for hamachi seeing as it would be linked to a paid account which would only be single user. Could be wrong about that, I don't use it at all as it's a waste of time.
#2: Hamachi is a waste of time for a number of reasons. It causes lots and lots of lag (I heard payed version improves that but it's still not a good plan in the long run), it requires your users to use a 3rd party app just to connect to your server (your server gotta be damn special to attract a decent player base as it is, let alone ones willing to take the time to set up shitty hamachi) and also it is yet another sign for people that your server really doesn't know what it's doing if it can't even manage to port forward/ip forward/host properly.
Anyways, I'd strongly recommend just forwarding your ports. If you have a dynamic ip, just use an ip forwarder so you don't need to worry about updating the ip to people.