Hi Kai,
Thank you for reporting this. The error is occurring because an assembly file is missing from the agent installer. We’ll get this added to the installer for the next version.
Meanwhile, you can get this working by copying the file ICSharpCode.SharpZipLib.dll from the server install directory (e.g. C:\Program Files\VSoft Technologies\ContinuaCI\Server) to the agent install directory (e.g. C:\Program Files\VSoft Technologies\ContinuaCI Agent), then restarting the Continua CI Agent Service.