What is the backstory behind why the company stopped selling this software? Has anyone asked the author or company about it? Would it be worth asking them to release the source since it's been so long since selling it?
It also seems that Plasma was never actually sold. It was a preview that just required a free signup.
He wrote an article explaining that the DDOS they suffered when first releasing Cube World had a lot of impact on his mental health and that is why he rarely communicated and then he disappeared again.