[header] How to install amx mod x [title] Since amx mod x is a metamod plugin, make sure you have installed metamod. [title] Download both the base package and the mod addon package for your half-life mod. [step] Alternatively, you can just download the full installer. 
[title] Extract the base package, then extract the mod addon package to the same directory. [step] Overwrite any files from the base package.