We could continue working on the Archicad plugin, including recompiling for compatibility with newer Archicad releases, if we had developers available for this. Sadly, we do not have any developers who could do it right now.
If you are an experienced developer who would be able to continue the development of the Archicad plugin, or if you know someone who could do that, please send us an email to hiring@corona-renderer.com and we will see what exactly the possibilities are.