For work anti-cheat Ultra Core Protector need install additional module AMX Mod X that works on the basis of Metamod, hence the need to first install Metamod, then AMX Mod X. Instructions on the example of mod Counter-Strike 1.6.
Create a directory cstrike/addons/metamod/dlls/ and copy the metamod.dll(for Windows) or metamod_i386.so(for Unix)
Create a file cstrike/addons/metamod/plugins.ini and add an entry win32 addons\amxmodx\dlls\amxmodx_mm.dll(for Windows) or linux addons/amxmodx/dlls/amxmodx_mm_i386.so(for Unix)
In the file cstrike/liblist.gam add a line gamedll “addons\metamod\dlls\metamod.dll”(for Windows) or gamedll_linux “addons\metamod\dlls\metamod_i386.so”(for Unix)