Gorbino's Quest 2003 V 1.2 is, as you all know, a masterpiece. It is a creation in and of itself. A pièce de résistance. Unfortunately it was taken down, due to malpractices from the creator. It seems his divine light was severed...
Anyways if you are presented with the "RPG maker 2003 RTP is not found" error when trying to execute RPG_RT.exe just add "FullPackageFlag=1" under the pre-existing lines of code in RPG_RT.ini. Should make it work. Have fun :D.