The screenshots provide some, but not all the necessary information, so I'll make some guesses here.
Based on tersus1.JPG, I understand that the web service returns a JSON string which seems to contain a single repetitive field (called d), though to be certain, I'll need to see the full string ...
Based on tersus2.JPG I presume that somewhere inside DownloadURL, there is a service process with a <URL> trigger (I'll call it S) receiving the URL passed to DownloadURL. My guess is that S has a single, non-repetitive, text-type exit.
It seems you have 2 options:
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