I installed the .NET Framework 4.6.1 using this URL: http://www.microsoft.com/en-us/download/details.aspx?id=49981
But when I open the Visual Studio project (2015), I can not select version 4.6.1
See image:
Why can't I choose 4.6.1 that I installed?
go to http://getdotnet.azurewebsites.net/target-dotnet-platforms.html https://www.microsoft.com/net/targeting
download and istall .NET Framework 4.6.1 Targeting Pack
.NET Framework 4.6.1 Targeting Pack
Then I recommend using an extension called Target Framework Migrator you can download it here https://visualstudiogallery.msdn.microsoft.com/47bded90-80d8-42af-bc35-4736fdd8cd13 or get it through tools-> extension and updates
Target Framework Migrator
Please note that if you change the target structure to 4.6.1 using the drop-down list in Visual Studio, you may run into VS, like within a minute or so, where using the Target Framework Migrator avoids this problem, and you can update everything projects into solution right away.
Also 4.6.1 comes with a preinstalled version of Visual Studio 2015 Update 2
You need to install update 2 or a web installation: https://www.microsoft.com/en-us/download/details.aspx?id=49981
the link to the .NET Framework 4.6.1 package is now changed to the following link https://www.microsoft.com/net/targeting