When I am installing Visual Studio 2015 now, it have been taking ages. As you can see the installer actually installing Update 1 but my iso is actually the first version without Update 1.
The install without seeking your consent and just go ahead and download don’t know how many GB files with my 2 mega bit Internet connection.
Don’t cancel your installation if it takes more than 2-3 hours. You might just have the slow Internet connection like I do. Mine still running for almost 7 hours now.
I think Visual Studio should install whatever in the ISO file and let ourselves to update the Visual Studio later.