DITA Open Toolkit versions used by the repository are stored in the DITA Toolkits folder in the Administration cabinet and are managed by administrators.
Beginning with Astoria 6.4, DITA-OT versions and their associated plugins are managed from within the Workbench, then shadowed to the server. Any DITA-OT version not stored in the repository will not be detected and thus not be displayed for selection when processing DITA structured documents.
Note: When a repository is upgraded to Astoria 6.4, all current DITA-OTs on the server will be automatically imported into the Administration cabinet in the repository during the upgrade.