I apologize if it's been already discussed... which I have a feeling it has. Either way, I can't seem to get the downloader to work on Mozilla Firefox. When I turn it on and click the link, I get a "page not found". But it does work properly when I log on using Internet Explorer.

You might want to contact support on this issue. I use Firefox and haven't had any problems downloading.

I haven't had any issue with Firefox and downloading direct or using the GOG Downloader. Which versions of each program are you using? Its probably 3.6.0 for the downloader and 29 for Firefox, correct? Do you have any strange extensions installed which might break things?