Wait, how do we fix this....
I have 4.22 and 4.23 latest versions of UE4. And I installed the latest Octane plugins for 4.22 and 4.23.
But on;y 4.23 works, 4.22 says
This build is not supported anymore. Please update to a newer version."
Is it talking about a newer version of UE4, like 4.23, or the plugin?...
I am thinking it's probably some strange activation thing on plugin side, because 4.23 works fine.
Ooh! I deleted the Octane folder from the 4.22.3 plugin directory where it was installed, and then reinstalled a fresh new one.
Now it works.
Win 10 Pro 64, Xeon E5-2687W v2 (8x 3.40GHz), G.Skill 64 GB DDR3-2400, ASRock X79 Extreme 11
Mobo: 1 Titan RTX, 1 Titan Xp
External: 6 Titan X Pascal, 2 GTX Titan X