You get a license number, and if you have to reformat, you just go back to the site, input the license number and you can download the certificate onto your newly formatted computer.
Wooptee freaking do. SAI is updated monthly anyway so you have to go to the site and download an update anyway.
It's a great program and if you can't login once in a blue moon to download the license then you shouldn't be using this program anyway.
Enjoy your crack and your corrupted files.