I’m trying to view my device(s) on Internet Explorer but it’s telling me I can’t download the plugins, why?

Please ensure you are in fact using Internet Explorer and not Edge. The two have similar icons, Edge is a darker blue lower case "e" whereas Internet Explorer is a lighter blue lower case "e" with a yellow ring going over the top left of the "e". Also note that on Windows 10 Edge is the default browser, Internet Explorer isn't on the task bar or the desktop, you can use Cortana and search "Internet Explorer" to launch.