diff --git a/web/app/assets/javascripts/clientUpdate.js b/web/app/assets/javascripts/clientUpdate.js
index a23529154..5df2ce32e 100644
--- a/web/app/assets/javascripts/clientUpdate.js
+++ b/web/app/assets/javascripts/clientUpdate.js
@@ -10,11 +10,11 @@
     var logger = context.JK.logger;
     var ellipsesJiggleTimer = null;
     var forceShow = false; // manual test helper
+    // updated once a download is started
     var updateUri = null;
+    var updateSize = 0;
     app.clientUpdating = false;
 
-    // updated once a download is started
-    var updateSize = 0;
 
     function cancelUpdate(e) {
       if ((e.ctrlKey || e.metaKey) && e.keyCode == 78) {
@@ -27,8 +27,10 @@
     // responsible for updating the contents of the update dialog
     // as well as registering for any event handlers
     function updateClientUpdateDialog(templateId, options) {
+      options = options || {};
+
       var template = $('#template-' + templateId).html();
-      var templateHtml = context.JK.fillTemplate(template, options);
+      var templateHtml = context._.template(template, options, {variable: 'data'});
 
       $('#client_update .dialog-inner').html(templateHtml);
 
@@ -69,12 +71,13 @@
     /***************************************/
     function clientUpdateDownloadProgress(bytesReceived, bytesTotal, downloadSpeedMegSec, timeRemaining) {
       // this fires way too many times to leave in. uncomment if debugging update feature
-      //logger.debug("bytesReceived: " + bytesReceived, ", bytesTotal: " + bytesTotal, ", downloadSpeed: " + downloadSpeedMegSec, ", timeRemaining: " + timeRemaining );
+      //logger.debug("bytesReceived: " + bytesReceived, ", bytesTotal: " + bytesTotal, ", downloadSpeed: " + downloadSpeedMegSec, ", timeRemaining: " + timeRemaining + ", updateSize: " + updateSize);
 
       bytesReceived = Number(bytesReceived)
       bytesTotal = Number(bytesTotal)
       // bytesTotal from Qt is not trust worthy; trust server's answer instead
-      $('#progress-bar').width(((bytesReceived / updateSize) * 100).toString() + "%")
+      var progressWidth = ((bytesReceived / updateSize) * 100).toString() + "%";
+      $('#progress-bar').width(progressWidth)
       //$("#progressbar_detail").text(parseInt(bytesReceived) + "/" + parseInt(updateSize))
     }
 
@@ -98,10 +101,27 @@
     }
 
 
-    function clientUpdateLaunchSuccess(updateLocation) {
-      logger.debug("client update launched successfully to: " + updateLocation);
+    function clientUpdateLaunchSuccess(userTimeToRead) {
+      if(userTimeToRead === undefined) {
+        userTimeToRead = 1000; // older clients didn't pass this in, and exit very quickly
+      }
 
-      updateClientUpdateDialog("update-restarting");
+      logger.debug("client update launching in: " + userTimeToRead);
+
+      // set timer to update countdown
+      var rounded =  Math.round(userTimeToRead / 1000);
+
+      // simple countdown timer
+      var timer = setInterval(function(){
+        var $countdown = $('#client_update .countdown-secs');
+        var countdown = parseInt($countdown.text());
+        $countdown.text(countdown - 1);
+        if(countdown == 0) {
+          clearInterval(timer);
+        }
+      }, rounded * 1000);
+
+      updateClientUpdateDialog("update-restarting", {countdown: rounded, os: context.JK.GetOSAsString()});
     }
 
     function clientUpdateLaunchFailure(errorMsg) {
@@ -167,7 +187,7 @@
       }
     }
 
-    function runCheck(product, version, uri, updateSize, currentVersion) {
+    function runCheck(product, version, uri, size, currentVersion) {
 
       if(currentVersion === undefined) {
         currentVersion = context.jamClient.ClientUpdateVersion();
@@ -191,6 +211,7 @@
       if (shouldUpdate(currentVersion, version)) {
         app.clientUpdating = true;
         updateUri = uri;
+        updateSize = size;
 
         if(context.JK.CurrentSessionModel && context.JK.CurrentSessionModel.inSession())  {
           logger.debug("deferring client update because in session")
@@ -210,7 +231,7 @@
     // check if updated is needed
     function check() {
 
-      var os = context.jamClient.GetOSAsString();
+      var os = context.JK.GetOSAsString();
 
       // check kill switch before all other logic
       if (!gon.check_for_client_updates) {
diff --git a/web/app/assets/stylesheets/client/clientUpdate.css.scss b/web/app/assets/stylesheets/client/clientUpdate.css.scss
index b22d78295..cc0321127 100644
--- a/web/app/assets/stylesheets/client/clientUpdate.css.scss
+++ b/web/app/assets/stylesheets/client/clientUpdate.css.scss
@@ -22,6 +22,12 @@
     display:block;
   }
 
+  .countdown-secs {
+    font-size:24px;
+    display:inline-block;
+    width:15px;
+  }
+
   h2 {
     font-weight:bold;
     font-size:x-large;
diff --git a/web/app/views/clients/_client_update.html.erb b/web/app/views/clients/_client_update.html.erb
index 51987a3a2..17fe2b868 100644
--- a/web/app/views/clients/_client_update.html.erb
+++ b/web/app/views/clients/_client_update.html.erb
@@ -75,8 +75,13 @@
   <br />
   <br />
   <div align="center">
-    This application will close automatically in a moment.
-    If it does not close, please restart it manually.
+    {% if(data.os == 'MacOSX') { %}
+      This application will close automatically in <span class="countdown-secs">{{data.countdown}}</span> {{data.countdown == 1 ? 'second' : 'seconds'}}.
+      If it does not close, please restart it manually or download the latest JamKazam from <a href="/downloads" rel="external">our downloads page</a>.
+    {% } else { %}
+      The updater will launch automatically in <span class="countdown-secs">{{data.countdown}}</span> seconds.
+      If you do not see a Windows updater, please restart it manually or download the latest JamKazam from <a href="/downloads" rel="external">our downloads page</a>.
+    {% } %}
   </div>
 </script>
 
@@ -90,7 +95,7 @@
     <p class="fix">Download the latest JamKazam from <a href="/downloads" rel="external">our downloads page</a>.</p>
     </div>
     <div class="error-detail">
-    {error_msg}
+    {{data.error_msg}}
     </div>
   </div>