Please visit the WebView2 website and download the WebView2 Runtime installer there. There is a single installer to download whatever platform you are on or just get the Windows 32 or 64-bit Intel full installers. The control may come pre-installed for future Windows 10 versions, but currently all clients have to install it for Windows 7 and newer.
For next MBS Xojo Plugins version 20.5 we add a WebView2ControlMBS control, which you can drop on your window in a project. If run on Windows, the control will try to load WebView2 and put it in a control. Please try the example project soon with new plugins.
Please do not hesitate to contact us with questions.