when launching cavestory it says where the datafiles need to be put if it can’t find them – they need to be put in ~/RetroPie/roms/ports/CaveStory so you have the file ~/RetroPie/roms/ports/CaveStory/Doukutsu.exe present
“Not working” is not going to help me help you (Unless you want me to guess?!)
make sure you have updated the script, then do a re-install of lr-nxengine from menu 5 (from binary). Once this is done, it should tell you where to place the files. Do this, and then if it doesn’t work, please report back with a) a copy of /tmp/runcommand.log (right after launching fails) and b) a description of what doesn’t work – does it give an error, does it show a dialog stating where to copy the roms, or something else etc.
there needs to be a folder created in the ports rom folder, it needs to be named “CaveStory” and in this folder you need to add the Doukutsu.exe and the data folder, both of these are to be found in your backup of nxengine-libretro