The solution turned out to be surprisingly easy.
Instead of the method described in the tutorial do as follows:
Install Powershell for your OS, if not already done.
In the solution, click on Tools/Library package Manager/Package Manager Console
After the PM> prompt type
The package gets installed, reading the log file shows that EfCodeFirst is obsolete and EntityFramework was installed instead.
Close the console window.
Look at Reference in the Solution Explorer, you should see EntityFramework there.