Ok, so I DLed those files and put them in the directory with my updater. When I try to run it it throws a big exception that says after some java error tracing "Could not load file or assembly 'Microsoft.Xna.Framework, Version=1.0.0.0, Culture=neutral, PublicKeyToken=6d5c3888ef60e27d' at osu.Program.Main()
It also has a warning about Assembly binding logging being turned off but that doesn't seem as important.
I tried loading the site you asked about in IE and I got a white page with this text on it:
_osume.exe 59b43de2cd284fe6a4a9253677434fc8 public bass.dll 26295a0baf87955f2e37735af135ca45 static noup bass_fx.dll f37e99af165262902b74b59784ba1a4d static noup Microsoft.Xna.Framework.dll 45a786658d3f69717652fed471d03ee0 static noup d3dx9_31.dll 797e24743937d67d69f28f2cf5052ee8 static noup x3daudio1_1.dll 121b131eaa369d8f58dacc5c39a77d80 static noup osu!.exe a18c7b8a27fd2b22006452a9b27806d8 public osu.dll c573222cc3a98ef0b270e8e48e5dd3b6 public zip
Hope that helps diagnose me. Thanks for helping.