Ninjatrader stores data in a database, the mdac is for interfacing with that database.
If you don't want to go through the whole process you can find the file on one of the ftp mirrors
here, i'd suggest the edu.
Of course files from unoffical sources might contain viruses and maybe it's not even what you are looking for.
The MS genuine advantage is some sort of anti piracy thing, I've never used it myself.
Hope you'll solve your problems this way.