Once extracted, the English.ltc file needs to be placed in the correct directory for the game to recognize it. Usually, the path is:
Delete the temporary game cache to force FM11 to rebuild its localized string table. Navigate to C:\Users\[YourUsername]\AppData\Local\Sports Interactive\Football Manager 2011\ and remove the cache folder. Verifying and Activating the Language Pack Football Manager 2011 English.ltc.rar