1. Install ScriptHook RDR2 and Lenny's Mod Loader
http://www.dev-c.com/rdr2/scripthookrdr2/
https://www.rdr2mods.com/downloads/rdr2/tools/76-lennys-mod-loader-rdr/

2. Drag and drop this mod's "lml" and "Blips.asi" into your game directory