So, it took me forever today to figure out how to get PostSharp working without installing it 'globally' with the msi installer. In a nutshell, you have to include a directory for example /lib/ with all of the PostSharp baggage: Default.psproj PostSharp.targets PostSharp-1.0.targets PostSharp-1.0.version PostSharp-AppDomain.config PostSharp-Platform.config PostSharp.Core.dll PostSharp.Core.pdb* PostSharp.Core.XmlSerialize... PostSharp.exe PostSharp.exe.config PostSharp.pdb* PostSharp.Laos.dll ......