Windows Anytime Upgrade (WAU) - Windows 7 Home Premium to Windows 7 Professional Upgrade. This is a boxed, fully packaged product that contains paper instructions and a key code ONLY, no CD/DVD is enclosed. This WAU is used to go from a Windows 7 Home Premium to Windows 7 Professional. The enclosed key code unlocks the chosen version of Windows 7 and since this is considered a license product, no returns are allowed. Note: You can use Windows Anytime Upgrade to upgrade from one 32-bit version of Windows 7 to another OR from one 64-bit version of Windows 7 to another, but you can?t upgrade from a 32-bit version of Windows 7 to a 64-bit version of Windows 7 or vice versa.

Additional Info:

Manufacturer: Microsoft
MFG. Model #: 7KC-00040
UPC: 882224941068
Manufacturer's Warranty: 90 DAYS