On the main page of a modded game you will see the mod name on one side and novalogic's game version number on the other. This number usually does not show the last digit. Mods such as the Black Ops 1.0 or BFM 1.3 use a different .exe version number like 1.7.1.
All you need to do is grab a unmodified DFX.exe (version 1.6.9.3) and simply replace the dfx.exe that is inside your mod folder.
That is all you gotta do. Then when loading the game up once again it should say instead of 1.7.1 it will say 1.6.9