The ArcGIS Workflow Manager system requires an enterprise geodatabase to support the central jobs repository.
Additional guidance on configuring the repository is included in the user guide installed with Workflow Manager (Classic).
ArcGIS Workflow Manager (Classic) Server has the same system requirements as ArcGIS Server and the version must match the ArcGIS Server version.
The license level must be ArcGIS Server Standard or ArcGIS Server Advanced on your machine.
Review the ArcGIS Server system requirements.