Increasing the limit of clients in an account

I am currently setting up a Hub and Spoke network that would eventually need more than 256 clients.

1 server and X number of clients connecting to the server
Since only 256 clients per account are permitted, is there a special license that is needed to do more than 256 clients.

Or is there a way for multiple accounts to be active on the same server using multiple instances of the hamachi client, that way all the clients will still see that one server

It would be best if there was only 1 account for all of the managed connections.