If you want to use the serial number on another computer or after reinstalling your operating system, you must deactivate the program on your current PC.
This "releases" the serial number from the current computer so that it can be used on another.
Note: You can also deactivate the program in the MAGIX Service Center, but it is much more convenient to do this with the integrated feature in MAGIX Music Maker.
can't move product to another computer although I bought it and its mine now.
And what product would that be? As far as I have found, all of Magix programs can be put on more than one computer - as pointed out by @coneman.
If you mean Music Maker, then no, you did not buy it - it's free. You do not purchase computer programs - they are not yours - you get a license to use them, that is all.
plus it has countlesss issues
Really? This unknown product has countless unknown issues. Wow!