I would say Abvent is the one developping the export addon that is included.
Have you tried Cinerender? It took me a little time to get to settings to get to Artlantis 4 render times, but I am quite happy with how things work with Cinerender for our office now. The amount of surfaces included in ArchiCAD and the subscription extra library is a lot bigger than what we have for Artlantis 4 and those that used bump, colour and so on image maps from Artlantis were pretty straight forward to set up as surfaces in ArchiCAD.
The option I described with saving to sketchup will also work for Artlantis 4, allthough you may need a copy of Sketchup to save it down to an older version.
I would give Cinerender a try. The only thing I kind of miss from Artlantis is the extra layers you could save out for the materials to quickly make some changes in photoshop.
Erwin Edel, Project Lead, Leloup Architectenwww.leloup.nl
ArchiCAD 9-26NED FULL
Windows 10 Pro
Adobe Design Premium CS5