At start, download the Non-Setup version of Vietcry.
1. Extract the "Vietcry.ZIP" File.
2. Copy the "Vietcry" folder to: "...\Steam\steamapps\common\Crysis\Mods".
3. Start Vietcry with the "32 Bit Application.Bat" from the Mod folder.
IMPORTANT !!!
1. You can NOT use the 64 Bit launcher, Steam donĀ“t have 64 Bit support for Crysis.
2. Your Crysis have to be patched at 1.2 ...... Checked ? ... Okay check it again !