How to export entire data table in .csv or .zip format using Export Data Table Rest API in CPQ ?

Summary:

We have a requirement to automate export of a data table from production and import to a lower instance, for this we want to export the data table as a whole (has lakhs of records) and push to lower instance, we tried using the out of the box REST API, actually through a series of APIs (/rest/v19/datatables/actions/export), (/rest/v19/tasks), (/rest/v19/tasks/{taskId}/files), (/rest/v19/tasks/{taskId}/files/{fileName}) but it does not downloads any file, it just returns some response in some format (application/octet-stream), but in help it says that it should download a file. Kindly help if anyone has used above APIs successfully or has faced