- Plesk for Linux
When manually installing the Amazon S3 Backup extension, the installation fails with:
PLESK_ERROR: Error: Unable to install the extension:
Plesk 17.8.4 is the earliest version supported by the package.
The Amazon S3 Backup extension requires Plesk version 17.8.
Upgrade Plesk to the version 17.8.
Note: currently Plesk 17.8 is in the preview state and is not supported by Plesk Technical Support.