Microsoft is no longer distributing Product Keys together with the runtime license envelopes.
The new process requires filling out a short form and sending it directly to Microsoft.
To get a product key you need a valid Microsoft Customer License Agreement.
This only affects the following products:
You will receive the requested product keys via email within 48 business hours directly from Microsoft.
Product Keys for the products listed above are no longer shipped with the runtime license envelopes.
You can get the product keys via the forms above only!