the download link was the following:
Maybe Tomas is right, in the disclaimer there is mentioned "for USA and Canada".
Most likely there are export restrictions depending upon the destination. I have run into this before with downloads. The resolution is usually an assurance by email or written document that there are no restrictions on the export of the specific content. Perhaps that was already in the works when you were trying to download?
i checked this and everythink looks fine so far. Could you provide a step-by-step description of the actions you are taking, enclose the link to the page you found the download source on and also a screenshot of the error message you are facing.
This should help to identify the reason and to resolve.
i also have the issue downloading from here with a scnsorry504.html:
Unfortunately there was a technical issue completing your download request. Please try again later.