Based on your subscriptions I understand that you come from the Joomla world and you're quite possibly relatively new to WordPress or didn't have to update any WordPress plugins from their free version to their premium version. Unlike modern Joomla, WordPress does not allow you to upload and install a new version of a plugin already installed. It's a lot like using Joomla! 1.0.
There are two solutions, just like back with Joomla! 1.0 in the early '00s.
The first but not recommended solution is uninstalling Akeeba Backup Core and installing Akeeba Backup Professional. Watch out! By doing this you will lose all your existing backups and your backup settings. Not quite the ideal solution if you already have a decent backup history.
The second and recommended solution is to overwrite the files using FTP. We have made a video tutorial about it
. Please watch that video and let me know if you have any questions.