Problems Upgrading From 3.2 to 3.6

I was handed an application developed with Monogame 3.2 and asked to upgrade it to 3.6. This was also going from Visual Studio 2013 to Visual Studio 2015.

After installing 3.6 and opening the solution the Visual Studio Migration Report gives me these errors:
The application which this project type is based on was not found. Please try this link for further information: http://go.microsoft.com/fwlink/?LinkID=299083&projecttype=6D335F3A-9D43-41b4-9D22-F6F17C4BE596

The application which this project type is based on was not found. Please try this link for further information: http://go.microsoft.com/fwlink/?LinkID=299083&projecttype=96E2B04D-8817-42c6-938A-82C39BA4D311

The problem was with ProjectName.csproj and ProjectNameCoreContent.contentproj

The projecttype is the XNA project type. I made a new MonoGame Windows project and it no longer uses that projecttype. And a .contentproj file is no longer being created.

Is there a preferred upgrade path here? Or should I just not upgrade from MonoGame3.2 ?

What I have done when upgrading is to create new blank project and manually add the code files and content to it.
Game/app specific code usually doesn’t depend on MonoGame version, but some things like Game class’ initialization and Input handling might need to be changed. Another issue might be in adding content to the app, but the Content Pipeline tool is easy to use.