I’m having the same problem. Everything is fine until I click the Let’s GO button. Then (in IE, because Firefox sometimes goes into a loop when I’m executing PHP) I get a “The page cannot be displayed” error. The URI is https://www.mydomain.ca/wp-admin/edit.php?page=wordpress-automatic-upgrade/wordpress-automatic-upgrade.php&task=getlatestfiles
Is this correct? Can anyone help?