While I agree that Roon Labs communications could be improved (a lot) - it was made clear in the original post:
This update is available for ROCK users running the UEFI build as well as for Nucleus One and Nucleus Titan users. We are actively developing a program to extend this update to a broader range of Nucleus devices - stay tuned!
Your screenshot shows that you have one of the original Nucleus models - and not either a Nucleus One or Nucleus Titan…
And, with respect, if you don’t consider yourself a gear head, you might be better off sticking with Production builds. In Early Access you can expect to encounter bumps in the road…