download in progress transaction not working

Hello. This is not working. I tried below code and get this error message. I am trying to download an in progress transaction since this cannot be done in the UI. I tried the below code but am getting the below error message. Can you please advise how to fix this issue and run the code correctly?

Error Message:
{"messageKey":"http.status.406","message":"Not Acceptable","code":406,"name":"Not Acceptable"}

Code:
curl -X 'GET' \
  'https://sandbox.esignlive.com/api/packages/SVDOZ5bwoDrJAd4WSbDEfNaYiUY=/documents/zip' \
  -H 'accept: application/json; esl-api-version=11' \
  -H 'Authorization: Basic api_key'