- 1). Right-click the zip file containing the map you want to add, then click "Extract All." Locate the [mapname].bsp file (where [mapname] is the name of the map you downloaded) that appears in the same folder as the zip file.
- 2). Click the "Start" button on your desktop, then click "Computer," then double-click "C:" in the window that appears.
- 3). Double-click the Program Files folder, then double-click the "Steam" folder and then "steamapps."
- 4). Double-click the "Garrysmod" folder," then click and drag the Mapname.bsp file into the "maps" folder to install the map.
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