When I installed Data Pump server edition I had to do exactly what you describe. Install the Monarch version that came with Data Pump and then install data pump. You can then go back and reinstall/upgrade to 7.X. Keep in mind (I learned the hard way)Data Pump does NOT support all of the features of Monarch 7.X. There is a new release of Data Pump coming out very shortly which is supposed to solve that. Good Luck!