It is highly likely what you received was a voucher code, which is a one time delivery system for download products.

You may redeem your voucher here. https://mediasoftwareapps.magix.com/esd

This will result in you receiving a confirmation email with the serial numbers and installer links for the products you ordered.

Install each product, then when first opening the software, you will be prompted to enter the serial number, which unlocks the program for use.