Put all the files in SP folder to 
Grand Theft Auto V\mods\update\x64\dlcpacks\mpbiker\dlc.rpf\x64\models\cdimages\mpbiker_male.rpf\mp_m_freemode_01_mp_m_bikerdlc_01

For FiveM u open the FiveM folder and drag the lostmcvests into your resources and then go to server.cfg and write start lostmcvests