Changes to Start Download

removed the success response with the status 200

added the non-success response with the status 401

added the non-success response with the status 403

added the non-success response with the status 409

added the non-success response with the status 413

added the non-success response with the status 422

added the non-success response with the status 503

added the success response with the status 202

endpoint added

api path removed without deprecation