This release addresses some known issues with Akeeba Kickstart Professional and Amazon S3 on servers lacking a server-wide CA certificate cache.
Error messages from S3 would not show up in the interface, making error resolution impossible
Download and extract this file locally. You will need to upload kickstart.php and - optionally - the INI translation file of your preferred language to your site's root alongside your archive.
This is not a Joomla! extension installation package. Kickstart works outside of Joomla!. Do not try to "install" Kickstart in Joomla!, it won't work. You do not "install" Kickstart, you just upload it to your site alongside the backup archive you want to extract.