I am a very happy KeyMart customer! I upgraded from Win 10 Home to Win 10 Pro, so I can use my laptop with a digital projector. The download worked great, after I learned HOW to do it, (had to "activate" the download in Windows) and my programs are all OPERATING great -- I had no need to reload any of them. And I backed up ALL my data to my exterior hard drive. And.. the upgrade came right from Microsoft! Go KeyMart!!