This is slightly abusive of gunzip, but it does work, but only because the zipfile in question only contains a single file and you are piping it in via shell.

This is slightly abusive of gunzip, but it does work, but only because the zipfile in question only contains a single file and you are piping it in via shell. If you had tried to download the file and then run gunzip on it the program would have refused. As for the second error, I think you might be trying to import an empty file or maybe an error message? Probably related to the first problem.