Play Ground Zeros in The Phantom Pain

https://www.nexusmods.com/metalgearsolidvtpp/mods/106 Snake Bite
very simple install, download the .exe off nexus, and run it. it will take you through the installation process. When in Snakebite, navigate to the "mods" tab click "Install .msgv" then select the mod you downloaded as a .mgsv every other mod uses this process to install.

Alternatively, Pudge007 has a handy video for this
https://www.youtube.com/watch?v=h1mjzxQh25Y

https://www.nexusmods.com/metalgearsolidvtpp/mods/1226 IHHook
IHHook used to be bundled in Infinite Heaven, but was added as a separate mod for support reasons. THIS IS REQUIRED

https://www.nexusmods.com/metalgearsolidvtpp/mods/45 Infinite Heaven
This is REQUIRED. Infinite Heaven lets you change your game on the fly, aswell as being super useful for modders.

https://github.com/Morbidslinky/FileMonolith/releases/tag/v0.5.0.0 File Transferrer
https://www.nexusmods.com/metalgearsolidvtpp/mods/739? Nexus Link
The file transferrer just transfers the archive files from your Ground Zeroes .exe to your Phantom Pain .exe

Open the "Archive Transferrer" as administrator, and select MGS:GZ and MGSV:TPP .exes it is really simple.
:\Program Files (x86)\Steam\steamapps\common\Metal Gear Solid Ground Zeroes
:\Program Files (x86)\Steam\steamapps\common\MGS_TPP

https://www.nexusmods.com/metalgearsolidvtpp/mods/978 US Naval Prison
Using the files you have copied from your GZ, this imports the location and makes it work with TPP.

INSTALL ONLY ONE VOICE PACK, EITHER:
US Naval Prison Facility Voice ENGLISH b4.mgsv for ENGLISH
US Naval Prison Facility Voice 日本人 b4.mgsv for JAPANESE

https://www.nexusmods.com/metalgearsolidvtpp/mods/2402 Ground Zeroes
Using the US Naval Prison, this brings in the mission data from GZ, aswell as having a fabulous transition between Phantom Limbs and the Mother Base Tutorial. you can also access GZ as Mission 51 in your IDroid.

In IHHook, you can enable Sortie, which lets you play as Venom Snake and your arsenal, otherwise you play as Big Boss with the GZ weapons

INSTALL THE CORRESPONDING VOICE PACK, EITHER:
GROUND ZEROES Voice English b33.mgsv if you installed ENGLISH
GROUND ZEROES Voice 日本語 b5.mgsv if you installed JAPANESE

https://www.nexusmods.com/metalgearsolidvtpp/mods/2047 Krokodil over Blackfoot for Pequod
This mod replaced Pequod's US helicopter for the Russian Krokodil seen in Ground Zeroes https://www.nexusmods.com/metalgearsolidvtpp/mods/695 Callsign Morpho
This mod replaces Pequod's voice with Morpho, your pilot in Ground Zeroes

Reinstall the Ground Zeroes mod on it's own Redo the Archive Transfer, as it didn't work properly This is a known issue, and can't be fixed, sorry

For any other help go to the MGS:V modding discord, they can help you there <3
http://discord.gg/yttPsfr