Can't download HTML ebooks

Hi, just installed Calibre for the first time. I'm trying to download some books, such as Dune, but it seems that I get errors whenever I try to download an HTML formatted book. Other formats seem to work fine however.

Here's the error message I get:


Starting job: Downloading Dune.html
Job: "Downloading Dune.html" failed with error:
Traceback (most recent call last):
File "site-packages\calibre\gui2\threaded_jobs.py", line 83, in start_work
File "site-packages\calibre\gui2\ebook_download.py", line 86, in __call__
File "site-packages\calibre\gui2\ebook_download.py", line 102, in _download
File "site-packages\calibre\gui2\ebook_download.py", line 69, in download_file
File "site-packages\mechanize\_mechanize.py", line 253, in open
File "site-packages\mechanize\_mechanize.py", line 309, in _mech_open
httperror_seek_wrapper: HTTP Error 500: Internal Server Error

Called with args: (, None, 'https://bookserver.archive.org/borrow/webview/dune00herb', u'Dune.html', u'', True, [], >) {u'notifications': , u'abort': , u'log': }


Any help possible?