There is a major bug in this patch. Game only see checkpoint maded at level start, all next checkpoints are in savegames folder, but not on the list in load menu (quicksaves works ok though). Checkpoints not shown in game are also not listed in sav_base.ini in levels folder. It ...
you can unzip the installer (with 7zip) and manually copy the "ZZZ FarOut Widescreen 1.0 Final.pak" file to your FCData folder. That'll work just fine for vanilla FarCry. Even has the license right there just for this specific usage. And that's a basic overview of what's going on ...