Glad to hear there’s a bit of progress.
If you can open your map in a previous/working version of the editor, you are able to copy/paste selected level actors between engines. (This also goes for copy/pasting blueprint nodes)
Since your crash mentions ‘Kismet’ (Kismet is what Blueprint used to be called in UE3) I suspect it is blueprint related. I also looked up what a .dylib file is and it is mac specific. (Also led me to this thread which mentions structs are to blame)