VisualStudio 14 stopped working after upgrading to Windows 10 build 9860?

Upon upgrading to Windows 10 build 9860, the latest Visual Studio 14 preview starting showing this error on startup:

The ‘Microsoft.VisualStudio.Editor.Implementation.EditorPackage’ package did not load correctly.

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Things didn’t get any better when you try to do anything in the shiny new IDE.. For example, here’s what happens when creating a new C# Console project:

Object of type ‘System.Collections.Generic.List’1[System.Lazy’1+Boxed[Microsoft.VisualSstudio.Text.IExtensionErrorHandler]]’ cannot be converted to type ‘System.Collections.Generic.List’1[System.Lazy’1[Microsoft.Text.IExtensionErrorHandler]]’.

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Fortunately, I found that repairing Microsoft Visual Studio Professional 14 CTP in Add/Remove Programs seems to fix the problem.. You will get the following error at the end of the repair procedure, but at least I’m able to use Visual Studio again afterwards:

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