Music Maker patch 29.0.4.25 downloads but does not update 28.0.3.53 after shutting down the program. I have downloaded the update 5 times with the same results.
Check your Antivirus program is not blocking or quarantining the update - several AVs are known to interfere with some Magix programs, detecting false positives.
In addition to what @johnebaker has suggested, your currently installed version, 28, is MM 2020, 32 bit; version 29 is MM 2021 and exclusively 64 bit. Is your version of Windows 64 bit?