I purchased my upgrade from OfficeDepot and this is the email I received ....
"Download this file to the computer that you are going to upgrade. The
download link is valid for 30 days after your purchase or 3 days after you
click the link. You can also obtain your file from the digital locker website
from Microsoft.
After the file is downloaded, follow the on-screen instructions to begin the
upgrade. The upgrade process will take approximately 60 to 90 minutes. You
may be prompted to insert a Windows Anytime Upgrade disc.
To ensure easy access to your upgrade license file in the future, a copy has
been saved in the digital locker. Learn more about digital locker and upgrade
file recovery process at
www.windowsanytimeupgrade.com/digitallocker."
I would wait for an email from Microsoft. If you don't get one from them in
24 hours, you will have to call them since that is where you purchased the
upgrade. You should get at least a confirmation of your purchase with
instructions. I didn't see anything in the digital locker for about 2 days;
then it was there.