Yes, it's true that Aldon will not support the Amethyst beyond WIN10 I think it is. I'd forgotten about that, sorry.
I'm running Version 10.0.19044 Build 19044 and it's fine. To be honest it does not really bother me as once I set up the unit with its advance curve, rev limit, etc, I have not touched it and it just works and does the job very well.
If I ever want to make changes I'll just dig out the old WIN10 laptop and use that to reprogramme the box. But yes, I agree that it is an issue for a new purchaser.