You can plug in a roccat mouse and it will just work, no software needed.
The only time you need the software is if you want to make a change (like what the side buttons do). However, I am sure you can find a computer with admin access, at your own personal comouter, some friends, etc. There has to be someone with an unlocked computer, you don't have to do it at work.
If you make your changes they will continue to work on any computer even without the software, so you can use it at work or any other computer without admun rights.