A while ago (maybe more than a year?), I got Magix Music Maker on Steam and bought a couple of commercial licensed sound pools. In December, MMM had a huge sale on Premium Edition (2022) and I bought that, later buying a few more soundpools. It recognized the older soundpools from Steam and added them into my local library without any trouble.
Yesterday, I signed onto Producer Planet and found that all the freebies and licensed products I bought via the software is there - except for the ones I bought on steam. It shows it as if I hadn't purchased them at all. I'm assuming because I bought the commercial license, I can still use it in videos, etc. That said, I don't have proof? I don't want to have to buy the license again. I really don't have that kind of cash to throw around.
To sum up my question: Is there a way to prove that I have a commercial license for the soundpools I already bought? In Steam it just shows up as "in game purchase."
Or... am I wrong to think the license isn't transferrable?