If the official launcher won't give you the files, you will need to manually place the English language pack into your game directory.
You can manually force the game to boot in English by editing the system config. Crysis 1 English Language Pack Download
Downloading a standalone "English Language Pack" for the original If the official launcher won't give you the
If you own the game on a modern digital storefront, you can often download the necessary language files directly through the client: Crysis 1 English Language Pack Download