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I have copied the same exact URL string from a working RSSOwl on one computer (Windows 7) to a second copy of RSSOwl on another machine (Vista). The newsreader will NOT download and throws the above error. I'm trying to get both Firefox and Thunderbird support newsgroups which work just fine on the Win7 machine to work on my laptop.
Any ideas? Version 2.1.6 of 2012-12-08
Seems like you had the newsgroup addon installed on the Windows 7 installation of RSSOwl, but not on Vista. You can install it from the "Tools | Addons" menu. If that does not solve your problem please export a log file, see http://www.rssowl.org/help#item_5