- Install Metamod:Source 1.4.2+ (use either the auto-installer or Read Instructions).
- Install SourceMod 126.96.36.1992+ (Read Instructions).
- Download CS:S DM.
- Extract the CS:S DM zip file to your cstrike folder. If you're uploading to FTP, upload the contents of the file to the cstrik folder.
- Edit the config files in cfg/cssdm to your liking. They are self-explanatory; do not edit cssdm.weapons.txt!
- Restart your server.