I believe the [Difficulty] + The Reunion is just the Beacause portion of Reunion. The other Reunion options you will select from the appropriate Reunion IRO if desired. You will also need to set your 7H client to use the ff7_bc.exe instead of the normal FF7.exe. Do note, that there are some random encounters that may cause the game to lock up with some of the difficulty mods. In my case, a battle scene in the Mt. Nibel area caused my game to crash when I had Hardcore + Beacause selected. To proceed, you will need to select just the difficulty mod without Beacause selected, then change it back after you pass the section.