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I checked this form : http://www.jotformpro.com/form/52504685580964
And I was able to download the PDF file with all the submissions.
Could you hare us the link or tell us the name of the form with you are getting the issue ?
We will wait your response.
Sorry, I meant that I can't access attachments that the end user uploaded when I download the PDF submission. I misread the original question. However, that problem still isn't fixed.
Sorry for the confusion.
I can see one of my colleagues has escalated it to our second level on this thread : http://www.jotform.com/answers/736637-Error-Webpage-unavailable-when-Downloading-attachments-from-links-in-submission-PDFs#6
You will be notified on that thread when the issue is solved.