They're automatically updated with a new version when we publish a new build. The DQEs depend on the ORMSupportClasses package, but not on the ADO.NET providers they indirectly depend on, you have to install these separately, to avoid a direct reference to these ADO.NET providers in your code as it's unnecessary to do that.
The packages are versioned with the format: 4.2.yyyymmdd, where yyyymmdd is the builddate.
The ORMSupportClasses package contains both the .NET 3.5 build and the .NET 4.5 build, so if you're using .NET 4.5 nuget automatically should pick the .NET 4.5 build with async/await support.