To install and play with the mod:
navigate to "steamapps\common\Halo The Master Chief Collection"
backup .map files from "Halo The Master Chief Collection/haloreach/maps" and all .bin files from "Halo The Master Chief Collection/haloreach/maps/fonts"
drag and drop the "maps" folder into "Halo The Master Chief Collection/haloreach/maps". and click "Replace the file in the destination"
backup "careerdb.xml" located in "Halo The Master Chief Collection/data/careerdb" and drag and drop "careerdb.xml" from "light_machine_gun_tags/data/careerdb" over it and replace.

launch MCC and play any of the campaign missions besides epilogue as well as Beachhead, Unearthed, and Installation 04 in firefight.

To install tags:
drag and drop the "tags" folder into "steamapps\common\HREK"
drag and drop all .bin files from "light_machine_gun_tags\maps\fonts" into "steamapps\common\HREK\maps\fonts"