Installation: Extract the DOOM3toDOOM2_v0.9.zip into the doom 3 directory (not the base folder!). Run Doom 3, select the Mod "Doom3 to Doom2 v0.9", start a new game and select a difficulty. Note: Resurrection of Evil comes with patch 1.2, but this mod needs the newest patch 1.3 of DOOM3!
This is a old version, so not download it !!!!