Before you can save your work on a computer, you will need to register your Isadora USB Key License on that computer.
Once you have received your USB key, follow these instructions to register your Isadora 3 or 4 USB Key License on a computer.
After completing this process on a computer, you will be able to save your work using the USB key version of Isadora 3 or 4 while your USB key is connected to that computer.