I just encountered a behavior which we had an 2.1.x : When initiating an update the process downloads the update.php but doesn't start the process. Do you already know of this? is there another way than to update manually?
|WordPress version (in x.y.z format)||4.8.3|
|PHP version (in x.y.z format)||7.0.23|
|Akeeba Backup version (x.y.z format)||2.3.3|