For Google Chrome and Firefox, it is a special way to install the plug-in, just open the Extensions and pull the plug-in into the UI and it will install it.
Here we take the Google Chrome for example:
1. Download the plug-in when you login your camera at the first time. Do the following step as picture 1:
2. Pull the plug-in that you downloaded and drop to the Extension UI you have opened and the plug-in will install it.
3. Choose “Add” as the following picture.
4. Please check if the plug-in was successfully installed or not.