You may know that people who purchased a new qualifying Windows 7 desktop or laptop after June 2, 2012 have the opportunity to upgrade to Windows 8 for as little as $14.99 (14.99EUR), but what you may not know is that the offer is available for basically everyone.
The promotion coupon used to purchase Windows 8 Pro via the Upgrade Assistant can be requested via Windows Upgrade Offer, technically it's only for people who bought a qualifying Windows 7 PC but the loophole is that Microsoft doesn't ask specific details like your Windows 7 serial key. You only need to enter some very basic information like the date of purchase, the PC brand, the name of the retailer and the model of your PC.
Many users report that after entering fake information, they received the coupon code via e-mail and were able to upgrade to Windows 8 for $14.99. Some users reported that the page requested them to enter a serial key, but they were able to get rid of the message by selecting a different country from the location menu on the Windows Upgrade Offer website or by entering different PC brand/model information.