First of all, good luck in this endeavor.
It is probably the best step to complete the Archicad.
First contact with the Corona Renderer - the best.
Although I use it Arnold-Maya many years , I can see speed without noice!And of course I use ΟΝΕ program!
My issues shown in Image!While working at the beginning ,after, show this issues.I can not use "Color selector".
(IN -> What is the name of our main license type - I do not know what to answer - and because of my problem I can not see the license in Archicad)
with regards
VASILIS
Translation -> google