Download links below.
FIVEM/ RP VERSION INSTALLATION:
1.) Extract the "424_tongva_hills" folder.
2.) Drag and drop "424_tongva_hills" folder to your resources folder.
3.) Then simply add this line to your server.cfg file
ensure 424_tongva_hills
SP/STORY MODE VERSION INSTALLATION:
1.) Extract 424_tongva_hills folder from "424_TongvaHills_SP". zip file.
2.) Place " 424_tongva_hills " folder in = Grand Theft Auto V\mods\update\x64\dlcpacks
3.) Add this line to your dlclist.xml :
dlcpacks:\424_tongva_hills\
Also I strongly suggest "Property Manager" script mod to make the map more dynamic . Link below.
NOTE: Unfortunately even with heightmap.dat file, the pool only works for NPCs because the location is too high in the map, also this map is not MLO so it will rain inside the house.