as the links are quite unusual, that’s only possible via scripting DEVONagent or DEVONthink Pro. For example:
tell application "DEVONagent"
set theSource to source of browser 1
set theURL to URL of browser 1
set theLinks to get links of theSource base URL theURL containing "Download"
repeat with theLink in theLinks
add download theLink
end repeat
end tell
When it’s necessary to get just a particular file type off a site (PDFs, MP3 or whatever) I’ve had great success with DownThemAll, a free Firefox extension. You can point DownThemAll to your inbox on disk and the files will be loaded right into DT.