Get Windows 8 Download $40 Offer valid from October 26, 2012 until January 31, 2013

Clicking "Download Pro" installs and runs the Windows 8 Upgrade Assistant, which lets you know if your PC can upgrade to Windows 8 Pro, provides you with a compatibility report, and then walks you through the steps to purchase, download, and install. Run the Windows 8 Upgrade Assistant to make sure your PC can upgrade to Windows 8 Pro before purchase—you can run it without purchasing. Upgrade Assistant will collect certain information about your potential upgrade experience. Learn more about privacy and the Upgrade Assistant.

If you purchase a new PC with Windows 8 preinstalled and you later upgrade that PC with Windows 8 Pro Pack, Windows 8 Media Center Pack, a volume license edition, or a retail edition, you will no longer be able to install apps that are provided exclusively from your PC manufacturer through the Windows Store.

Each upgrade license applies to only one PC and you can install the upgrade only on PCs that have a valid base license and one of the following operating systems: Windows 7, Windows Vista, or Windows XP SP3.