The latest Internet Explorer version is getting stricter and it is not allowing the plug-in to run automatically. To solve this, simply add the IP address of the security system in Compatibility View settings.
Go to the Tools menu and select Compatibility View Settings.
On this page, type the IP address of the security system and hit the Add button. Then, hit Close.
Refresh the webpage. Internet Explorer will ask you if you want the plug-in to run and then click on Allow.
It will now show the split-screens on the page. Click on the Play button on the bottom right to start the live streaming.