CoD4 Error: Impure client detected - Invalid IWD files referenced by Vrandas



The Auto-Download makes a nice extra for the Call of Duty series.

Custom maps and Game Modifications (Mods) get distributed to the players when they enter a server.

But for years now this auto-download system has two tricky elements that can result in getting errors instead of playing some nice custom maps.

No, we cant blaim the CoD creators, Infinity Ward, for this; because the two "weakest links" are the Map/Mod makers and Server-administrators.

Simply said: Maps/mods must contain all necessary to run without errors. Map/Mods must contain unic files. And it is up to the server-admins to use and distribute the maps and mods correctly.

Or else you, as player, get to see this...



You get errors and want to know how to fix this ? Click on READ MORE for some answers.


The easiest way to get rid of the error-screens is just delete the 2 folders where the maps and mods are placed in by the servers.

Delete the folders: usermaps and mods from your Activision folder.
(This is the standard folder where CoD4 gets installed in.)



And this is all you have to do! Problem solved.


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When you again visite servers with custom material you will get a new set of folders.

Map/Mod makers and Server-administrators are working on this problem aswell. They are trying to find out when/why exactly the error-screens pop up and by knowing why they can try to avoid creating errors.

When there is any news about this subject we will report this on our website.