Web reporting - designer plugin for IE

Hi, I am looking inside a sample ASP .NET C# app, that comes with List&Label 19 installation to understand how it works. I am running this sample app in IE 11.0.5 (localhost) and it keeps saying, that I need to install designer plugin to show properly.

I have searched this forum and articles and I have found plufgins for opera, chrome, safari, firefox, but nothing for IE.

Can anyone please suggest, what to do to run this correctly? Thank you.