If you get a “..package did not load correctly” error in Microsoft Visual Studio, this can be easily fixed with through the command prompt.
Close all running instances of Visual Studio. Run the following from the command line with administrative rights:
devenv /clearcache devenv /updateconfiguration
If devenv.exe isn’t in the path, you will have to run it from its folder in Visual Studio. This file can be found in the ../Common7/IDE folder in the Visual Studio installation folders.