Hi,

I will try to help you please follow the directions.
Open Magix Music Maker 16
On Key Board click Y or from File/Settings/Program settings.

Program settings box will be opened
at the top right click on Folder Tab
Scroll down look around left bottom for
"Add VST Plug-in path"
Click on it
Synth folder will be opened here you can see
you VST available plug-in in this case look for
"Revolta" if you can see means it is available in your
system. Click on it then click ok again ok close Program settings. It is better to re-start computer and Open Music Maker 16 and see if you can find Revolta.

Note: You did not mention if you use download or box version, some times in download version installation could be incomplete and create problem. 

Feel free to contact if you need further help.

Thank you
nihon94