Same issue

This mod has not been updated in quite some time, and so is not compatible with the current version of R.W.R.. Other older mods that have not been updated at a certain point will also be subject to this problem, they are just dead and likely won't be coming back unless someone gets permission to revive it or the author does it themself (very unlikely, alot of modders have moved on). Very unfortunate but not much can be done. ;(