Last Christmas, I bought Vegas Pro 18 on Amazon for about $200 which includes Sound Forge 14 with it as well as the RX 7 editor. However, the product only got me the serial number for Vegas Pro and does not include the keys for the other apps, which is really upsetting because I wanted to register these on my account as well! Any help on this?
You could also contact infoservice@magix.net to see if they are still able to help. (Found a related comment re VP 18 from 2021 on amazon.com by "Magix Support Team".)
Sadly, there is a time limit on when you can put in a complaint with Amazon and get a refund, and you've exceeded that time limit. Follow the instructions from @vkmast above and maybe something can happen.