, you must manually source .bsp files and place them in your game's directory. Since CS 1.1 predates the Steam Workshop, you will rely on legacy community archives. Guide to Counter-Strike 1.1 Deathmatch Maps 1. Where to Find Downloads
Downloading maps for CS 1.1 is an exercise in nostalgia. The version featured several maps that are now considered "forgotten," such as cs_thunder de_rotterdam Download Map Deathmatch Cs 1.1