Hi,
I have read this thread a few times and I have exactly the same problem with the midi contenst (packages) with my superior drummer 2.
I run a Mac OS Sierra System 10.12.6 and had to reinstall my system and every apllication on it a fews day ago. Unfortunately it is not possible for me to install any of my midid packages and also the midi parts of the SDX expansion I have. In the end I have my SD 2 working but nor acces to any midi grooves. What could I try to solve this problem?