EasyRPG is in Zerojay's RetroPie-Extra repo. I had it working but something went wrong with my SD card and I started a new SD card and it does not want to work now.
https://github.com/zerojay/RetroPie-Extra
When it worked, I just copied the directory of the game files into the RetroPie/ports/easyrpgplayer/games folder.
I didn't have the RTP files when it was working, but the installation file says to copy the RTP into the RetroPie/ports/easyrpg/data folder. I would guess that it would have to be the files and directories as I don't think .exe files work on the Pi.
https://github.com/zerojay/RetroPie-Extra/blob/master/scriptmodules/ports/easyrpgplayer.sh
Trying to troubleshoot it. Seeing if I can install the dependencies and then reinstall it.