Need help extracting large number of DITA XML content files out of SDL Pub Manager 11.1

This question has not been answered yet, but Paul Filkin kindly moved me to this correct forum.

As I see some others were able to use scripts to import a large number of files, I am looking for info (a script or other) about how to extract about 20k DITA XML content files out of an older version of SDL (Pub Manager 11.1) in a batch rather than in small numbers manually, which will take too long for our immediate time constraints.

We are looking to move these files to an FTP server while we prepare to migrate them to a diff auth environment. Any scripts or info you can provide will be very helpful. Thanks