Tim Burleigh go to site settings then forced update. then from there go to your cpannel file manager go to where your una.io files are stored go to periodic then change .htaccess to somthing like .htaccess.bak type your website name adding /periodic/cron.php  at the end of it click search if it gives you a error like this one >> allow_url_include is on (you need to disable it, or your site will be unsafe) just add a php.ini file within periodic folder click it wait for the white page to stop loading then go back to your site within a min it should have updated i updated this way from 10.0.0-Rc2

P.S. Dont forget to change .htaccess back to .htaccess