msvcp120.dll
This file belongs to Microsoft Visual C++ 2013 Redistributable. Install that package and the DLL arrives with it, in the right place and correctly registered.
Do not download this DLL on its own
Searching for a missing DLL by name leads to sites that hand you that single file. It is one of the oldest and most effective malware delivery methods there is, and a system DLL from an unknown source is indistinguishable from a deliberately modified one. There is never a legitimate reason to obtain a runtime component that way.
What it is
The C++ standard library from the Visual Studio 2013 runtime, shipping in the same 2013 redistributable as msvcr120.dll.
Where you see it: The same era of software, usually alongside a msvcr120.dll error.
Install Microsoft Visual C++ 2013 Redistributable
The official package, with the download URL Microsoft declares and the SHA-256 of every installer so you can verify it before running.
After downloading you can check the file against our index to confirm it is the installer the publisher shipped.