"Well, some good news – I tracked down Arthur and he is alive – he broke his leg twice (!) in January, and got shoved into a nursing home for 3 months.
He’s out now, and very slowly recuperating, but his computer & toys & paints are all buried under an accumulation that has built up in the interim.
I’m not sure when he hopes to have it excavated and available for access again."
So at least we now know that he's still with us. Let us hope that he will soon be able to get to his computer and rejoin us.