The game might be looking for assets specific to one region, but a different version is installed, especially with the localized_English_iw files in the main folder.
Mastering the Call of Duty: World at War "English Zone" File Error: A Complete Guide Call Of Duty World At War English Zone File Download
Download the verified localized_english_iw00.iwd or specific map zone files from a trusted community archive (such as ModDB or verified community Discord repositories). The game might be looking for assets specific
: The common "ERROR: Could not find zone..." message often points to a missing or corrupted .ff (FastFile) file in the zone/english folder. but a different version is installed