installationProgress.IE9InstructionsHtml Property

var u = $au.uploader({
    //...other params...
});
var ip = $au.installationProgress(u);
ip.IE9InstructionsHtml("<p>To install Image Uploader, please click <strong>Allow</strong> or <strong>Install</strong> on the <strong>Notification Bar</strong> at the bottom of the page.</p><p>Then after the page is reloaded click <strong>Install</strong> when you see the control installation dialog. If you don't see Notification Bar, please try to reload the page and/or check your security settings.</p>");
//...other params...
u.writeHtml();