Left 4 Dead 2 - Sourcemod 8 Players Quick Tutorial

link of plugin and other required items is in the description. extract the 8 players sourcemod, drag the cfg and addons to the L4D2 Directory and then head on over to the addons, sourcemod and then configs and open admins_simple.ini and do as following in the video right click L4D2 and click properties, type -insecure in launch console you may switch between 4 or 8 players just by enabling or disabling the -insecure command from the launch consoles. (in any case you want to play on official dedicated servers again, remove -insecure!)