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The mod I was talking about that fixes in single player is called something like L4D1 population fix. Can't remember the exact name
Sorry friend, I don't have any experience creating mods like this one - I only knew how to take what was existing and make it work for L4D1 maps, and wanted to share with fellow users of the original mod. Sadly I don't think the original author will give you a response either, as they didn't update it themselves and never responded when I notified them of this compatibility fix to see if they wanted to upload it on the original mod