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#11
You can get a legitimate retail copy of Windows 8.1 from Newegg. See my above post:
Upgrade from Home to Ultimate
"Retail" means that you can move it from computer to computer as much as you want to, using it on only one computer at a time.
You can install Classic Shell in Windows 8.1 to make it look and feel exactly like Windows 7. This is literally your last chance to have something that is just like Windows 7, and receive five more years of support from Microsoft.