Music Maker is free. There is no other version. There are only add-ons, like Premium Edition for which you pay and which is probably what you bought - you didn't say. Once Music Maker is installed, you have to log in. Then on the welcome screen you can activate whatever Edition it was that you bought - once only. Some features will be downloaded automatically, others you will have to go to the Downloads tab and download and install them.
Note - again, you always have be logged in to have access to whatever Editions that you purchased, otherwise Music Maker will just show the Free Edition.
In addition to the excellent advice that @browj2 has given you, I notice you titled your post as "Magix 24". I assume you mean the 2024 version. Is that correct?
MM 2024 is actually version 32 (latest release is 32.0.2.11). If you check under Help>About Music Maker, which version is shown for you?