Silver and Copper are not part of the current version anymore as there are new synths. If you still have the old version there will be somewhere in the menu a link "Download content" or similiar (help?), I am not sure if these are still active....
I have put Copper and silver on MM16 from MM12 here is how to do it go in to Program Data on the old version and under Magix folder there will be two one for MM16 and one for MM12 open the mm12 and yo will see a folder called Synth open it there you will see two folders one copper one silver copy both of these to the same folder in mm16 open it and they are there but you will not see the picture but they do work fine