IMPORTANT
You need Open IV to install this mod.

To install the mod you just have to replace the files in : 
mods/update/x64/dlcpacks/mpstunt/dlc.rpf/x64/levels/gta5/props/mp_stunt_hoardings.rpf
by the files wich are in the mods 1 folder.

Replace the files in :
mods/update/x64/dlcpacks/mpsum/dlc.rpf/x64/levels/gta5/props/prop_sum_track_hoardings.rpf
by the files wich are in the mods 2 folder.

Replace the files in :
mods/update/x64/dlcpacks/mpheist/dlc.rpf/x64/levels/gta5/props/prop_ch_arcade_race.rpf
by the files wich are in the mods 3 folder.

If you want to uninstall the mod, you just have to replace the files modified by the original files which are in the "original" folders.

enjoy !