Since it seems you already have at least one other Magix product, go to C:\Users\[your user name]\Documents and search for a folder named MAGIX Downloads.
If it is not to be found there, it should be shown in your (default) Downloads folder. If you're not sure how to find this, in the Desktop Search Box type, This PC. The screen that opens should show you a folder named Downloads, check in there.
From MMM2025 onwards there is no more MMM free version, but a 30-day trial version. You can install the trial version with the downloaded installation file (trial_musicmaker2025premium_dlm_7r9jf0--phEAV2nfrWRJtCMZsa.exe) that is in your download folder. If you have installed MMM2025 with this, you can start MMM2025 via the shortcut on your desktop. You only need to register this trial version.
Please note!! If you have the freeware version MMM2024 on your computer, it is possible that it will be overwritten by MMM2025