Yes – the USB Key Edition of Isadora.
For users who must work on several computers, or who must move between Macintosh and Windows platforms, we recommend the USB Key (i.e., “dongle”) Edition of Isadora. Once you've installed the USB Key version of Isadora on a given computer, it's as simple as inserting the USB Key into the USB port and starting up the program. You'll be able to edit and save on that computer until you remove the key.
To learn more about the USB Key Edition, visit "How does USB Key licensing system work?"