Thanks for the reply. Yes, the link is working now for me also, perhaps a simple glitch yesterday with the server.
Nevertheless, I downloaded all the sources from the trunk, compiled them in my Visual Studio and started MediaPortal - hmm, looks strange. I checked AssemblyInfo.cs and found that the version number is 0.9.4.x, not 1.x as it should be. So the question remains, what do I have to do to get the latest build 1.x RC4 to my development machine?