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When EVERYTHING is Nigel Thornberry

By that I mean all of the Special infected. They have his face. All of them BUT the charger since I forgot him until now.
READ THIS DESCRIPTION IF YOU GET CONSISTENCY ERRORS ♥♥♥♥♥♥♥♥ I WILL NOT TOLORATE NON-READERS ON MY PROPERTY FOR THEY WILL BE SHOT AND SHOT AGAIN UNTIL THEY HAVE STUMPS FOR CHICKENS

Anyhow, if you run into this issue of Consistency checks, you can only play it in Single Player or Specific servers with the Console cvar sv_consistency set to 0.

To access the console to begin with, go from the main menu to Options > Keyboard and Mouse > Enable Developer Console

Then press the Tilde key (~)

Type in to this console "sv_consistency 0" without quotes

Then you can play in singleplayer OR those servers that actually allow mods like this.