first you will need lml and Red Dead beta out of bounds
lml: https://www.rdr2mods.com/downloads/rdr2/tools/76-lennys-mod-loader-rdr/
put ymaps here Red Dead Redemption 2\lml\stream
if you don't have the stream folder, create one inside lml (don't create it inside the download folder)
and install the Undead Towns folder on the dowload folder of lml
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if you are going to use ambient gang compatibility, just put the files of "ambient gang compatibility"
 in the ambient gang folder