If you were installing the new Visual Studio 2015 Update 2 and the setup interrupted by bad Internet connection or some other reason; you can continue the process by running the update again but from the command line with the option of /repair like this:

vs2015.2.exe /repair

Then the repair starts:

vs2015 update 2

To get to the command line quickly and make it point to the correct location of your file you can use SHIFT + Right Click then choose Open Command window here:

Open Command Here

I like Windows 10 shortcuts 🙂