We must inform you that the YouTube application installed will only be functional through the keyboard and cannot be controlled using a mouse. Nonetheless, you can still get an app for YouTube on your Windows 10 PC with a neat trick.
They had earlier also declined to make an app for Windows phones. There have recently been rumors that Google might be working on a dedicated application for Windows 10 recently, but it has not been confirmed, nor has Google made any comment on the matter.