Prerequisites:
Liberty city(duh)-works with all versions including 1.01(recommended, 3.0, V, Rewind, and Remix)
gameconfig
packfil limiadjuster
heapadjuster

Go to OpenIV and go through this path 
mods\update\x64\dlcpacks\manhatny\dlc.rpf\x64\levels\gta5\ny\manhat

copy files from manhat_metadata folder to manhat_metadata.rpf
copy files from manhat01 folder to manhat01.rpf

