About this mod:
Mesh converted from Call of Duty, textured and rigged by P&Q Mods
This is a replace for mask #14

Single Player installation:
Use OpenIV, click "Edit mode" and just drag and drop all files here:
Grand Theft Auto V\x64w.rpf\dlcpacks\mpbusiness\dlc.rpf\x64\models\cdimages\mpbusiness.rpf\mp_m_freemode_01_male_freemode_business

FiveM installation:
Open your stream folder and just drag and drop all files. 
If you want to use it as an addon just check this tutorial: https://forum.cfx.re/t/how-to-streaming-addon-clothes-and-ped-props-for-mp-freemode-models/458854