Visual Studio - IDE

Visual Studio CE is configured to be installed as the default IDE when installing Unity. For help with VS installation errors see Unity forums

Visual Studio Community Edition ( for Windows or Mac ) https://www.visualstudio.com/vs/community/

Unity Video Instructions for Installation /Setup Visual Studio https://unity3d.com/learn/tutorials/topics/scripting/installation-and-setup-visual-studio?playlist=17117

MonoDevelop - no longer supported by Unity If the MonoDevelop IDE opens instead of Visual Studio, then download Visual Studio Community Edition and install it, pay attention to the install location folder. Then, Re-open Unity, in the top menu, select Unity > Preferences > External Tools. In the External Tools dropdown, select Visual Studio. If Visual Studio doesn't show up in the drop down options, then browse to the install location to select it.