can i just buy a key for our development server? if so how do i do that for the copy of the code we have?

I've inherited a project that is using Xupload Pro V 2.5. Are the pro features only going to work on the client's server IP? I'm asking because I've been banging my head trying to figure out why I can't get the multi file uploads working and it occurred to me that it may not work on my development s...