Back in 2010(?), I purchased two upgrade keys for $29 each. The pricing was offered to my girlfriend who was college faculty member at the time. I recently used one of the keys to do a clean install on an old PC with a brand new SSD. Windows 7 didn't care that it was an upgrade key and the PC had nothing on the SSD. The installing went smoothly. The Windows 7 ISO was downloaded directly from Microsoft's official website: "Windows 7 Home Premium x64 ISO 64-bit" http://www.nextofwindows.com/download-retail-windows-7-iso-from-official-website/ Since I have one more key, I was wondering if it's possible to do the same on a Macbook Air 11 (2013) via Boot Camp? Thanks!