If you own a Russian or Latin American Spanish version of BO3, the game’s registry keys might block English. Simply changing the Battle.net or Steam language often triggers a 15GB redownload of everything —which fails if your license is region-locked. Hence, the manual download.
Downloading English language files for Call of Duty: Black Ops III If you own a Russian or Latin American
Assuming you have sourced a verified "extra quality" English pack from a community hub (such as CS.RIN.RU or reputable Steam forums), follow this surgical process: follow this surgical process: