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The answer to your question is here:
https://una.io/d/ugrading-from-una-12-1-0-to-13-0-0-b2
Update button in dashboard will update your site incrementally through all versions, In your case, first RC1 > then RC2.
The answer to your question is here:
https://una.io/d/ugrading-from-una-12-1-0-to-13-0-0-b2
Update button in dashboard will update your site incrementally through all versions, In your case, first RC1 > then RC2.