"Runtime Libraries Error "Missing api-ms-win-crt-runtime-l1-1.0.dll" Our Testing Team has discovered that, in some situations, a system error mentioning missing runtime libraries may occur. These Runtime Libraries are normally installed with the regular Windows Updates but can easily be added manually by following the Microsoft article https://support.microsoft.com/en-us/kb/2999226. Without this "Microsoft Visual C++ Redistributable for Visual Studio 2015" update installed, the OLAP, SSIS or new MS Tabular Cube functionality may not function correctly.