That would be the issue. The editor started requiring Visual Studio 2015 to compile when 4.10 released. You can continue to use 2013 by selecting it in your preferences, but 2015 must be installed as the toolchain installed along with it is what must be used to compile the any C++ relating to UE4. 2017 is compatible as well.
You can get any of these versions for free under their Community license on Microsoft’s website, but be sure that the EULA and ToS match what you will be using the software for.