I have finally upgraded and had to rebuild my system from scratch.

However, when I launch IoX finder I get the following.

It does not seem to cause any trouble with the admin console or with logging in. I click OK and it goes away? Thoughts anyone?

After updating did you clear your java cache, checking all 3 boxes, then download the IoX Launcher from here:

https://isy.universal-devices.com/start.jnlp

That worked! Many thanks to you.I had to allow .jnlp apps past my Apple protection and then re-find my ip address for my eisy but now all is good. And version 6.0 seems to be much smoother and faster. Now to try to understand the eisy-ui and set that up. It's an exciting world!