Your diving into a very grey area of software licensing. The vendors like to write in the End-User License Agreement that you can only install it on one machine. I think technically if you bought the G2 Upgrade yes it would work. That device is what Realflight is trying to use to control distribution of the software. Software EULA have been taken to court a enormous amount of times for questions just like this, and it's 50/50 on what happens. I treat my software like I treat my my music CD's, I own them and allowed to play them in any device that I own. Since I legally am allowed law to make copies of software and music for personal backups that I purchased, I don't see the issue if I want to put a piece of software on multiple machines, as long as it's for personal not corporate use. The exception to this being your Operating System, since it technically becomes a permanent part of your system and can't be removed or transported between machines. There are many of nights that the machine I normally run software on is in use by the wife and I'm not going out and purchasing another $200 software so I can sit for a hour playing on my laptop. So you just need to ask yourself if you can sleep at night walking that grey line. If you can then a bit of research will point you in the right direction of how to make a "backup" copy of G2. RCU isn't the place for that type of information though. I think in your case though, spending $80 for the controller should cover the cost of a "additional license" nicely.