first make a COPY of the sins/entrenchment folders in another path possibly on another drive, then download, extract & run either my sins txtbin gui or my modding utilities v1.1
the files in the forge tools are from 2 versions ago, and with my utilities you can get a copy of the current files.
if you are modding entrenchment you only NEED the files you want to change in the mods-entrenchment v1.03 mod folder, but for vanilla sins you still need ALL the files in the mods-V1.17 mod folder
hope this helps
harpo