Your product key can be found in the lower right hand corner of your disc’s sleeve as seen below.
Upon successful processing of your online purchase, you will be directed to a Thank You page that contains the product key. You may also find the product key in the order confirmation letter.
If you got your software free as a bundled version, the CD sleeve should have a sticker attached to it. A product key is not required for pre-installed software.
A product key is not required for subscription software.