Launcher installation:
1) Download launcher: Launcher v1.1

2) Install the launcher into root game folder.

3) Start the launcher and wait for the update, then play.

Manual installation:
1)Download MANUAL VERSION OF FCAV: FCAV MANUAL DOWNLOAD

2)Before this be sure to delete OpenFC from Far Cry 1 Root folder and FCAV out of Mods folder(which is located in root game folder)
if you had previous version of FCAV

3)Extract out of downloaded file FCAV.zip two folders (OpenFC and Mods) into ROOT GAME folder (it's not bin32).

How Far Cry 1 Folder look(Example for lamers):