Unable to install other version than Plesk 12.5.30 on Debian 8. The following message is shown:
ERROR: There is no product with ID 'plesk' at download site. Run Plesk Installer with --show-releases option to get list of products and their latest releases available for installation. Use --show-all-releases option to get list of all products and their releases at download site.
Only Plesk 12.5.30 is available for Debian 8. If it is required to install previous version of Plesk, consider changing OS version.