Saving your Fusion 360 design in your local storage
You've mentioned earlier that your license is about to expire. The good news is it will prompt you options of renewing your educational license. I figured that you asked about these because you're worried that your precious thesis file that you put in so much effort will be lost. Luckily all design files from f360 is saved in the cloud (internet connection required). So there's pretty much nothing to worry about. Anyhow, here's a quick tutorial on how to save your f360 design file on your local storage as a safety precaution.
Step 1: click on the file icon and select export.
Step 2: click on the type's drop-down menu and select "Archive Files (.f3D)"
Step 3: apply check on "save to my computer, select the folder destination and hit save