I saw 2 versions of the premium editions floating around 2020 and 2021 if I got the 2020 edition would it have less content in it or something cos I'm confused as to what the differences are
Music Maker is FREE! There is only one version. When you pay for Plus or Premium, you get additional features, presets, and credits for some instruments and Soundpools (mostly your choice).
The latest version of Music Maker is the only one available on the Magix website - 64 bit version. If you get Premium 2020, you will not get any of the things that are indicated as new for 2021; this should be obvious. See the comparison table.
I noticed your other message. If you already had a Plus or Premium version, even more than one, activate it or them in the new version of MMM2021. If you get a new code, activate it as well and some credits for instruments and Soundpools should show up. Everything will have to be downloaded and installed. Add Soundpools will have to be done to tell the new Music Maker where they are (any previously installed Soundpools).
John CB