I don't see the navigation for files in your html...
Soluttion:
Try reinstalling, and see if it's working. (but don't reconfigure it yourself, and see if it's work), if it's work, then it's your mistake.
And
- Before you delete some files, please make backup first.
Remember:
Reconfiguring the downloads, to work like ipb 4x, as i detected require to have php skills. Cause of this problem is your mistake in reconfiguring the ip.downloads settings.