Yes! When you purchase an Isadora USB Key License, we will send you an Isadora 30-Day Temporary License via email that will work with both Isadora 4 and 3. This license works with the non-USB key version of Isadora, which is normally used with Isadora Perpetual, Subscription, and Rental licences.
You will need to download and install the non-USB key version of Isadora from our Get It page, then follow these instructions for activating an Isadora license using the temporary license information you received via email.
Once your USB key arrives, you will switch to using the USB key version of Isadora and the USB key licensing system (which does not use the online License Portal). You should then read our article that explains how to register your Isadora USB Key License.