Are you sure you’re actually downloading the raw file? Or are you just downloading GitHub’s HTML page that displays it? That is, you want to use the URL of https://github.com/Gregstrq/Isotope-data/raw/9dd2180ba3bc6caf67063a59601af3e0960edbae/isotopes_data.tar.gz — note that that has a /raw/ in there instead of the blob.
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