I've installed the Game of the Year version of both FO3 and New Vegas, and both of them are from Steam. After i re-locate the folder of my Fallout 3 in the Installation and ran the Install button, it saids :
"Checking for required files...
[16/05/2016 5:19:08 PM] Fallout3.esm could not be found. [16/05/2016 5:19:08 PM] Anchorage.esm could not be found. [16/05/2016 5:19:08 PM] ThePitt.esm could not be found. [16/05/2016 5:19:08 PM] BrokenSteel.esm could not be found. [16/05/2016 5:19:08 PM] PointLookout.esm could not be found. [16/05/2016 5:19:08 PM] Zeta.esm could not be found. [16/05/2016 5:19:08 PM] Fallout - Meshes.bsa could not be found. [16/05/2016 5:19:08 PM] Fallout - Misc.bsa could not be found. [16/05/2016 5:19:08 PM] Fallout - Textures.bsa could not be found. [16/05/2016 5:19:08 PM] Fallout - MenuVoices.bsa could not be found. [16/05/2016 5:19:08 PM] Fallout - Sound.bsa could not be found. [16/05/2016 5:19:08 PM] Fallout - Voices.bsa could not be found. [16/05/2016 5:19:08 PM] Anchorage - Main.bsa could not be found. [16/05/2016 5:19:08 PM] Anchorage - Sounds.bsa could not be found. [16/05/2016 5:19:08 PM] ThePitt - Main.bsa could not be found. [16/05/2016 5:19:08 PM] ThePitt - Sounds.bsa could not be found. [16/05/2016 5:19:08 PM] BrokenSteel - Main.bsa could not be found. [16/05/2016 5:19:08 PM] BrokenSteel - Sounds.bsa could not be found. [16/05/2016 5:19:08 PM] PointLookout - Main.bsa could not be found. [16/05/2016 5:19:08 PM] PointLookout - Sounds.bsa could not be found. [16/05/2016 5:19:08 PM] Zeta - Main.bsa could not be found. [16/05/2016 5:19:08 PM] Zeta - Sounds.bsa could not be found. [16/05/2016 5:19:08 PM] The above files were not found. Make sure your Fallout 3 location is accurate and try again. Installation failed. "
I am pretty sure that EVERYTHING that is mentioned is present in the said folder. That includes all of the requirements for this mod. Did i missed something ? Or is it because of the "Alpha" stage ?