Unfortunately, this type of applications and basically everything that is book-related required the physical purchase. This means you won't have the possibility to download the product, although the key is in your possession.
Find another PC and make sure you have a USB flash drive with more than 4GB of free space, just in case this is a DVD.
Copy the contents of the CD/DVD to USB on another PC and then use the same flash drive to install the product on your PC. It might look like a tedious process, but it works when your primary PC doesn't have a CD/DVD-Rom.