As Dr. Gordon Freeman, you were last seen exiting City 17 with Alyx Vance as the Citadel erupted amidst a storm of unknown proportions. In Episode Two, you must battle and race against Combine forces as you traverse the White Forest to deliver a crucial information packet stolen from the Citadel to an enclave of fellow resistance scientists.
e3_bugbait is a official map from Valve in 2003 featuring a daytime Nova Prospekt. Remake of this map from City 17, a mod by Frere D'Arme unreleased in 2009.
So...what, do I install it in the same folder?
Install the map in 'maps' folder of your game (City 17 compatible)