Yes, you have to do that to connect to each camera.
Suggest 10.0.0.150 for connecting to camera 1
And suggest 192.168.254.100 for camera 2
Camera 2 address is typical of the range used by Hikvision NVR PoE ports.
The Camera 1 address seems anomalous - but we can sort that later once you've got the admin password.
No - the PC IP address isn't assigned by the NVR. Contrary to popular belief the Hikvision NVR doesn't provide DHCP services.
But it does manage the network configuration of any cameras that's it's been given admin access to.
The 169.254.121.85 address on the PC is a 'self-administered address' that the PC provides for itself when there is no DHCP server, and no static address defined.
OK - when you've set the PC IP address to match each target camera as suggested above, use these URLs
Hopefully you will get 2 configuration files, which you can zip up and attach here.