For me, at least, I found Nikon Camera Control to be more trouble that it's worth. You can change most of the menu items rather using the camera's menu. Whoop! The problem that I remember was that you had to use someother software to actually shoot tethered. ViewNX? Not sure. I'm thinking that it hadn't been updated in quite sometime. Perhaps it has been now.
There is another product that some people like that is nowhere near $145.00. I'll try to locate it and reply to your post.
As far as retrying a trial is concerned, most companies either put something in the registry that isn't removed on uninstallation or put a file somewhere that shows when the trial started.