Ok, so it appears as though my App Manager is broken. I've re-installed OS2008 50-2, and have NOT restored my backup. I go into the App Manager, allow it to refresh, and everything shows up fine. When I click on a package to install, it proceeds as if it's going to install, but when it gets to the 'download' part, it just stops and says 'downloading <package name> failed.'

That's it. That's all I get.