You could try chrome, need to check the NVR and camera firmware versions. Can you post them? fuzz out any serial numbers.It installed without an issue or any errors. When I rebooted the machine, it asked me again, and I installed it again.
I can see the live view when I log into a single camera, but not when I log into the NVR, so I don't think it's the plugin.
I'm using Microsoft Edge browser. I could try install Chrome?
Also make sure win10 / 11 and VM software is updated.
Hikconnect working shows that this could be browser / firmware related.
I can't see port forwarding affecting this.
David