Windows Upgrade Offer - Landing Page
select your location
enter your personal information
in windows purchase information enter date of purchase 12th june 2012, a common retailer any pc and model....
after getting the code you will be lead though win8 comp. check and afterwards you can buy in the app
before paying it asks to enter your code and thats it.
$40 is still one hell of a deal for a new OS, just buy it now while you can and enjoy the discount. the $15 is for those that bought windows 7 machines just months before it got replaced with windows 8.