We used several mods for ambiance, but the map only requires Devourering's Necroplague Mutants, and Not what they seem.... Playing from this source is the best way to do that without all of the mods the PBO requires.
To use from source:
cd "\Path\To\Arma 3\MPMissions"
git clone https://github.com/tsal/att_halloween_2022.Stratis.git
Open att_halloween.Stratis in Eden, ignore warnings, then save. This will clean out any mods you don't want to require beyond the three (? TBD) listed above.