This is only the Beta Version of Halo: Reach - Legends
How to Install:

Simply backup the file of [m70_bonus] to another folder, where you can easily find.
Then drag and drop the modified [m70_bonus] in your steam directory of MCC
SteamLibrary\steamapps\common\Halo The MAster Cheif Collection\haloreach\maps\m70_bonus.

Simply have fun!

If you encounter any bugs or crashes, pls let me know in the Nexus mod, or via my Discord -NateSpidey18#5485