Got msvcr120.dll missing wamp error while installing wamp on windows 10 OS

You are missing at least one of Microsofts MSVC C/C++ Runtime libraries required to run Apache/PHP or MySQL.

Look here on the WAMPServer backup repo Down at the bottom you will find a link called

All VC Redistribuable Packages (x86_x64) (32 & 64bits)

Download that ZIP file, it contains all the needed installs for all the needed MSVC Runtimes.

Unzip it, then run each MSVC Runtime version install One-at-a-Time in logical version number order, oldest first. If you see a dialog saying that the version is installed click the REPAIR button to make sure its correctly installed.

As you are using a 64bit windows and a 64bit WAMPServer, you MUST install BOTH the 32bit AND 64bit MSVC Runtimes.

Once all these are installed, uninstall WAMPServer, manually delete the C:\wamp64 folder and then reinstall WAMPServer. This is required to be absolutely sure that the install works correctly, as without these MSVC Runtimes parts of the install can fail.

Small Note

The first dialog shown by the Install does actually tell you to make sure these runtime libraries are installed before continuing with the install.