Tim Burleigh  if you have changed "inc/classes/BxDolUpgrader.php" in the past on V9 or V10, then you need to revert it back.

Change: 

protected $_sUrlVersionCheck = 'https://v.una.io/beta/';

Back To:

protected $_sUrlVersionCheck = 'https://v.una.io/'; 

This will allow for beta release updates to be applied.