Not sure what forum should be used for Client Area issues.

You are about to download the file \'IP.Board 3.1.3 to 3.1.4 Upgrade Pack\'. Please take a moment to review the following disclaimer. Afterwards click the \'Download File\' button to download the file.

What are those slashes doing there? Having trouble with escaping?

There's a bug tracker category for website issues:

http://community.invisionpower.com/tracker/project-38-ips-web-site-and-client-area-not-for-software-issues/

I know I've seen this issue before, too, not sure if it's been reported already.