@Buggel , that link is 404 for me as well.
Maybe the HTTP port isn't the typical 80, so it must be put at the end of the URL like :XX.
I know I had a Foscam once that the default HTTP port was 88 so the URL was
camera-IP:88 into the browser to reach the cam's webGUI.
If so, you could install the free
Fing app on your smartphone, get onto your LAN's Wi-Fi with it, scan your network, find the cam, select it, then scan for its ports; it should reveal any available ports on the cam like HTTP, RTSP, HTTPS, etc.