1. Make backup copy of your patch.dat and patch.fat files in your far cry 3/data_win32 folder and place them somwwhere where you wil be able to restore it if you'd like to.<br />

2. Unpack archive in the game folder (eg place new patch.dat and patch.fat files into the "data_win32" folder)<br />

3. Make both patch.dat and patch.fat read-only via right-click -> properties<br />

4. Enjoy!