Left4Modders

WARNING:
BACKUP your pak01_dir.vpk before replacing it, this will make L4D2 campaigns crash at the beginning, you'll just have to switch between the original and the one in the pack depending on what you want to play.

If you already replaced it, just delete pak01_dir.vpk and on steam verify the game cache for L4D2, it will redownload.

Step 1. Fixing textures and models

- Copy over all of the vpks from your ../Steam/steamapps/common/left 4 dead/left4dead/ folder to some temporary folder.
- Rename all the pak01_xxx.vpk and pak01_dir.vpk files to pak02_xxx.vpk and pak02_dir.vpk respectively.
- Move the renamed files to ../Steam/steamapps/common/left 4 dead 2/left4dead2/

Step 2. Copying the maps and fixing sounds

- Copy the following folders from ../Steam/steamapps/common/left 4 dead/left4dead/ to ../Steam/steamapps/common/left 4 dead 2/left4dead2/ :
---- maps
---- reslists
---- sound
---- scenes

(When asked if you want to merge folders select "Yes to all", when asked if you want to replace files select "No to all")

Step 3. Bug Fixing
Thanks to myself and Smashman, this is all you gotta do, extract to the common folder and replace all:
http://www.mediafire.com/?nymzmytyt40

After that, download the latest patch and extract it like you did for the above, REPLACE ALL:
http://www.mediafire.com/?2odjdjzofzv

Step 4. Play

- Open up L4D2.
- Type in console: snd_rebuildaudiocache, it will take a long while, if it gets to 100% and doesn't exit you can just ctrl+alt+del and restart the game after.
- The L4D1 campaigns will appear in addons.

UPCOMING

All that is left to do is making L4D2 weapon and item spawns on the old maps.