Now i cant enter akeeba from the WP menu.
Everybody will be able to see its contents. Do not include usernames, passwords or any other sensitive information.
Please install the new version manually: download the new version's ZIP file, extract it and then upload the contents of the extracted akeebabackupwp folder into your site's wp-content/plugins/akeebabackupwp folder.
Why does this happen? The new version includes an update to the restore.php file used to install the update itself. However, this means that during the update the restore.php file is overwritten with the new version. Depending on the speed of your server it's possible that at this point the update is not done and requires one or more further steps. Since the new version of restore.php is incompatible with the old one it will cause the update to report an error. That's why you need to install the new version manually if you do see such an error. Unfortunately we had to provide a new version of restore.php for security reasons, even though that might break the update experience, as we explained in the News section of our site.