Did you change the camera IP address ? It should be changes to the same subnet as your PC. What is your PC ip address ? It should not be left as 192.168.1.108 as it will conflict with the next installed Dahua camera.
Also most modern browser (chrome,firefox,safari ) do not support plugins. So you may not be able to view the video. You can view the camera configuration screens on most cameras.
You can try internet explorer or palemoon 32.
In the config tool widen the search range, the gear at the Center of the top of the page .