basicly its a different version so you wont need as many addons sorry for lua errors i have no clue why they're still popping up heres what you need http://www.garrysmod.org/downloads/?a=view&id=99802 HL2 old version http://www.garrysmod.org/downloads/?a=view&id=100684
sorry the R E models aren't in the map
but heres the link for the models not needed for map
http://www.garrysmod.org/downloads/?a=view&id=80744 it fixes the requirement problems and i think the idle zombies but you may get lua errors and i cant fix this for some this for some reason so thats why its called kinda