Go to https://www.windowsupgradeoffer.com Windows 7 PC purchase information Date of purchase *Make up any date within last 2 months. Name of retailer * Just say whatever retailer. PC Brand *I typed in Carbide 500r PC Model * I typed in random anything. That is all it requires, no receipt verification is needed. Anyone can upgrade to Windows 8 Pro for $14.99. It gives you a promo code, and you download and install from there. source Founded by a user on techpowerup edit How to use your key on a clean install instead of upgrade.