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Access to ECMWF servers is done over HTTPS. Your Python version does not support HTTPS. See above on how to check the ssl support in Python.

assert total == size AssertionError or "Transfer interrupted, retrying..."

This means that the Web API client script failed to transfer the data from the ECMWF servers to your local machine. The reasons can be:
  • Connectivity network issues.
  • Local disk space or file systems issues

(lightbulb) Check if the results are still available in your job list

(smile) If not, you may wish to rerun the request

(warning) Check if you have installed the latest api client from our Web-API Downloads