How to install Npgsql as a data provider for ADO.NET Entity Framework?

I've read everything you can imagine, but I'm out of luck. In Visual Studio 2015 Enterprise update 1, I followed exactly the steps as described in the tutorial on link :

• I downloaded and installed: Setup_NpgsqlDdexProvider;

• I added the packages to my project

• I installed the recommended package of npgsql 3.1.6 , it also installed Npgsql on GAC ea machine.config , EntityFramework6.Npgsql ;

• I installed packages in the project with nuget :

          

changed machine.config into % SystemRoot% \ Microsoft.NET \ Framework \ v4.0.30319 \ CONFIG e% SystemRoot% \ Microsoft.NET \ Framework64 \ v4.0.30319 \ CONFIG para Npgsql versão 3.1.6

But when I go to add entity data ADO.NET , I check database model. I set the connection, testo and it returns me success however upon returning from the connection window, the wizard closes immediately.