Just realised that the wording in the help article is somewhat confusing. It implies that following the steps will move Roon OS from early access to Production, but actually what it is doing is moving Roon from Early Access to Production.
It’s a different file that needs to be placed in the Reinstall directory to deal with moving Roon OS from Early Access to Production - and I don’t know where the link to that is. It may have been mentioned in the EA forum; I’ll need to search for it…
Edit: it’s here: