Go to C:\Users\[YourUserName]\AppData\Roaming\Sports Interactive\Football Manager 2010\ and delete the cache folder. This step forces the game to rebuild the language index.
: If you purchased the game directly through the Steam store, it typically includes all supported languages by default, though regional physical copies may still require manual file additions. Option for English language simply disappeared! HELP! fm 2010 language pack 9 languages repack
C:\Program Files\Sports Interactive\Football Manager 2010\data\languages\ Copy Files : Paste the extracted files into the Change in Game Launch the game and go to Preferences fm 2010 language pack 9 languages repack