How to install a new Map. there are to cases: a) you got *.bsp files b) you got a *.vpk file When you see a step devided into a) and b), you must do different things in this step for these cases. Step 1 a) put all files to its places. b) put the file into "*Left 4 Dead 2left4dead2addon" and enable addon support. Step 2 (only b) Get the bsp file names. (vpk files contain *.bsp files) There are 3 possibilities 1) maybe the map author will give you the names 2) use a program that can browse vpk files 3) open the game, type "map " into the console (without "", with the space after 'map', do not confirm the command). with arrow up and arrow down, you can now scroll through all bsp names. Step 3 Open the launcher, go to 'SetUp', then 'Edit Map Lists'. Step 4 select a game mode. note: you must repeat this for all game modes. Step 5 If you want to make a new MapPack, click on 'Add' below the MapPack List. Step 6 Make sure that the MapPack that you want to edit is selected in the MapPack List. Step 7 To add new Maps to the MapPack, click 'New'. Step 8 To edit a map, click on its entry in the Map List. Step 9 In MapName, you can select the name that is shown in the launcher. Step 10 a) Use the Browse button ('...') to select the *.bsp file of the map b) Type in the name of the map's bsp file (only the file name, without path and file extension (eg 'c1m1_hotel') Tips: don't be confused about the map list in the editor. it's very simple if you understood it. Every entry is: MapName=FileName The launcher will sort the maps alphabetically, so give them numbers in their names. To get a space as the first char of a MapName, press (and hold) the ALT key, then type '0160' with your num block, and then unhold the ALT key.