If on a Mac you can MOVE app (applications) to external devices and they should run with no problem. I do this with several of my apps and 2 of them are games. On Windows this will also work but most likely only if you INSTALL TO THE EXTERNAL DRIVE. When I used to use Windows I knew a few tricks which allowed me to run Windows applications from external drives even if I did not install to the external drives (which includes flash drives too). You can keep this external drive connected to your computer, this is what I do on my Mac...no problems.