First you need to download "EASY MOD FOLDER":
link: https://www.gta5-mods.com/tools/emfsp-easy-mod-folder-for-sp-player-mods
in order for this mod to work and get extra slots for michael, franklin and trevor.

After installing the easy mod folder, move the two files to the following folder with OpenIV

If you want the LV mask for Trevor:
Grand Theft Auto V\mods\update\x64\dlcpacks\EMFsingleplayer\dlc.rpf\x64\streamedpedprops.rpf\player_two_p

If you want the LV mask for Franklin:
Grand Theft Auto V\mods\update\x64\dlcpacks\EMFsingleplayer\dlc.rpf\x64\streamedpedprops.rpf\player_one_p

