Visual Studio 2015重新安装包

Question

安装VS2015更新1 RC后,我再也无法加载C#项目了.错误是:

CreateInstance failed for package [CSharpPackage]

Could not load file or assembly 'Microsoft.VisualStudio.LanguageServices.CSharp, Version=1.1.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35' or one of its dependencies. The located assembly's manifest definition does not match the assembly reference. (Exception from HRESULT: 0x80131040)

我尝试了修复操作没有成功,我尝试了clearcache选项但没有成功.

知道如何手动删除/重新安装此包吗？