Edit: Oh, I see the thread is now titled as solved. Cool. Ignore the below then.
No, there is a window.hpp include in graphics.hpp (line 32 in my version).
What did you set your include path to in your compiler? The graphics.hpp one is explicitly <SFML/Window.hpp> so it's looking in the include path for that. So you'd need to have External\include as part of the include path.
In visual studio c++, the addition includes setting is either relative to the project (where the .vcxproj file is) or an absolute path. If you are using mingw or something, that's not my area.
If you aren't sure how to get the correct include path, let us know the absolute path of where your window.hpp file is (for example c:\sdks\External\include\SFML\window.hpp) and the absolute path for your project file (for example C:\Users\kojack\source\repos\ConsoleApplication24\ConsoleApplication24.vcxproj).