NVGNX.dll loader for RDR2 used for modding FSR2 into the game. R* will probably never update FSR2 to the newest version or they won't keep updating it and currently latest version of the FSR2 binaries crashes the game but we can mod the newest version into the game using this
the version when R* added DLSS to the game or higher(I don't remember the version number)
ASI loader dinput8.dll which comes with Script Hook RDR2 or version.dll which you can download from rdr2mods website
download any of the mentioned asi loaders put them where RDR2.exe is located downoad NVGX_Loader.asi and nvngx_loader_options.toml fromhere and extract it on the same place. download DLSS2FSR from here then extract it on the same place and enjoy.