Deploying Internet Explorer 11 to entire office

My organization is currently on IE8, due to vendor requirements. Those requirements have since changed, allowing us to go to IE11. I've been in WSUS, trying to tell it to install IE11 on my test boxes. WSUS shows the IE11 update as Installed/not applicable, which is probably where some of my problem lies.

How do I get IE8 to IE11 from the server for ~300 machines? An MSI with Group Policy? WSUS, another way? Any help is greatly appreciated.