Each time I attempt to download an addon via the Curse Client, the download fails. I downloaded a whole slew of addons with it earlier, so I'm wondering if there's something messed up on my end, or if Curse itself is experiencing difficulties of some sort.

Thanks for any help you can provide! 

OrganiClockwork,

Another user reported a workaround here: http://www.curse.com/forums/t/110027.aspx

Although I also think it could be related to releasing a new client version yesterday and heavy load on the curse.com websites.

If you are still experiencing that problem today, please check your folder permissions and try what is suggested in that thread.