We’ve released a fix for this issue with Roon 1480 and ARC 1.0.60 respectively.
Unfortunately, logs show your ARC instances ingested the offending data from RoonServe before the update, so you’ll need to reinstall ARC to resolve the issue.
Once reinstalled, however, you shouldn’t find yourself stuck on the “Time for an Update” screen inaccurately again. The underlying issue has been resolved.