Not exactly sure what happened but again I have this modified solution to offer that would first download the files and later import them all into CSV and even collect them in a KNIME table in the end. If one download fails you could resume the download, that might be faster and more robust than to use the file reader directly. In the hub, there are all files contained from your example.
As a side note, you might want to think about using the relative KNIME paths like:
knime://knime.workflow/../data/
They are more robust and easier to handle and you can transfer your folder/workflow without having to worry about paths.