When entering a license, you can indicate where the license has to be stored:
- For the current user/student account
- For this computer (and all its users)
Most likely, you'll want to use the latter option, so you have to only enter the code once.
You'll need to have administrator rights, though. Possibly you'll have to run the program as administrator, but that depends on your configuration...
Next time you'll enter the license, it should be able to save it!