If a user does not have visual studio installed, they are not able to create new Blueprint script components and are given the error message "No compiler was found. In order to use C++ code, you must first installed Visual Studio 2013."
1. Uninstall Visual Studio (Or use a computer without it)
2. Create a new project (Or open existing)
3. Add a new blueprint script component (This can be done by selecting an object in the world outliner and hitting 'Add Component...' then selecting 'Add Blueprint Script Component'
4. Select a component class
5. Notice that you are given an error message and that the button to create it is grayed out.
Head over to the existingAnswerHub thread and let us know what's up.