I recently came to this error, when I was upgrading a win 8 computer to win 8 pro. When I go and put in the credit card information, i get an error message:“We couldn’t process your order”
This error messages is due to the fact that Microsoft is Out of Stock of win 8 pro pack.
Some how Microsoft ran out of Windows 8 Pro Pack product keys.
Here is the link:
Hopefully they manage to get more in, we need to upgrade.