Go to http s://www. windowsupgradeoffer. com, 去除空格。
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 Lenovo
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.