Hi :) I bought this in 2016. May I install it on an another pc?. It's running Win 7 64 bit. Don't got the serial, though
Maybe it shows the serial under the Help -> About menu?
If you registered your software back in 2016 you'll find your serial in your user account on Magix.com. You just need your mail and password for your login.
With your serial you can also download there newest version of Music Maker and activate all features of the Score Edition.
If you never registered your serial number and it's now lost you will have to contact sales support at infoservice@magix.net and show them your order confirmation and ask for help.
If you don't have anything anymore your are probably out of luck.