Forum:How to play as infected on Left 4 Dead 2 (Not demo ver.) ?

I've trying to find it for like 1 month. Asking to other ppl what is the codes? and they say ; 1-> download this file and copy to folder c:steam/communuti..... (NOT THIS) it's for demo ver

2-> try the left 4 dead (1)'s codes to change it versus mode and play with the new infecteds (NOT WORKING) mean ; sv_cheats 1 sb_all_bot team 1 -- director_no_zombies > This bull shit not working on left 4 dead 2 (unknown_command) -- director_force_versus_start M to switch

3-> try ; (NOT WORKING AGAIN) sv_cheats 1 sb_all_bot team 1 director_force_versus_start sb_unstick 0 vs_max_team_switches 99 mp_gamemode versus -> not working on left 4 dead 2 (unknown_command)

4- ???

5- The real answer pleaseeeeeeeeee i got sick of it lemme play with those new infecteds on left 4 dead 2 help me what are the codes of being play with new special infecteds on left 4 dead 2 ?