They install it even if you uninstalled the previous Edge (there's no uninstall for this one now), they pop up a full screen modal with no X or cancel then they add Edge to your desktop and system tray. Then when you use your normal browser, they ask if you're sure you want that as the default.

They did this just after making it impossible to manually skip updates ("to prevent confusion"), and also shipped it to Windows 7, which is supposed to be EOL'd.