- Plesk Onyx
Some of the old XML API operators had been dropped with the new Plesk version and therefore are no longer supported.
Is it possible to downgrade XML API version?
No, it is not possible to downgrade the API version.
If the unsupported operator functionality is needed it can be requested through the User voice portal: How to suggest a feature request for Plesk?
The User Voice portal is a hub where our community can suggest and request features for Plesk to be implemented through a voting system.
The most voted suggestions are most likely to be implemented in future product updates.
Note: Additionally, most of the operation done via API can be accomplished via Command-Line Interface (CLI) through the Command Line Utilities