Hello,
I understand that you would like to download your source code using the command. I have looked at our documentation and found that the command, appcfg.py, is deprecated and that the Google Cloud SDK does not support downloading the source code[1].
There is an alternative as mentioned here[2] where you can view the code, then manually copy and paste it to your local machine. “As of October 2019 you can simply go to --> App Engine --> Services and in the tool dropdown select 'source' and the source code is there”
I would like to investigate further. To do this, can you tell me what kind of App Engine you are using?
I know this is not ideal but it is a workaround but this is something you can try if in the meantime.
[1] https://cloud.google.com/appengine/docs/standard/python/tools/downloading-source-code
Thank you.
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