Please install the latest plug-in

When I try to use Windows 10 to view video recordings I get a message “Please install the latest plug-in. Close your browser before installation.”
It does not state what plug-in. Does anyone know?

The plugin as I know only work with Windows IE only. Which is on Windows 7. On Windows 10, you can load IE browser if it installed.

Ok, it worked in IE but when I try to download videos it now said the same thing. Everything else works.
Thanks