If you’re seeing that there is a new update available for Advanced Sermons Pro but it is stating that the download is not available, this is because you have not activated your license key on your WordPress installation.
In order to download updates, you must activate your license key after purchasing. To activate your license, please following the online documentation: Activate & Manage Your License
Once you have activated your license key, you can then go back to the plugins page and update Advanced Sermons Pro to the latest version.