diff --git a/h5p.classes.php b/h5p.classes.php
index 7f87f7c..71e95c4 100644
--- a/h5p.classes.php
+++ b/h5p.classes.php
@@ -1055,24 +1055,27 @@ class H5PValidator {
     $valid = $this->isValidRequiredH5pData($h5pData, $required, $library_name);
     $valid = $this->isValidOptionalH5pData($h5pData, $optional, $library_name) && $valid;
 
-    // Test library core version requirement.  If no requirement is set,
-    // this implicitly means 1.0, which shall work on newer versions
-    // too.
+    // Check the library's required API version of Core.
+    // If no requirement is set this implicitly means 1.0.
     if (isset($h5pData['coreApi']) && !empty($h5pData['coreApi'])) {
       if (($h5pData['coreApi']['majorVersion'] > H5PCore::$coreApi['majorVersion']) ||
-          (($h5pData['coreApi']['majorVersion'] == H5PCore::$coreApi['majorVersion']) &&
-            ($h5pData['coreApi']['minorVersion'] > H5PCore::$coreApi['minorVersion'])))
-      {
+          ( ($h5pData['coreApi']['majorVersion'] == H5PCore::$coreApi['majorVersion']) &&
+            ($h5pData['coreApi']['minorVersion'] > H5PCore::$coreApi['minorVersion']) )) {
+
         $this->h5pF->setErrorMessage(
-          $this->h5pF->t('The library "%libraryName" requires H5P %requiredVersion, but only H5P %coreApi is installed.',
-          array(
-            '%libraryName' => $library_name,
-            '%requiredVersion' => $h5pData['coreApi']['majorVersion'] . '.' . $h5pData['coreApi']['minorVersion'],
-            '%coreApi' => H5PCore::$coreApi['majorVersion'] . '.' . H5PCore::$coreApi['minorVersion']
-          )));
+            $this->h5pF->t('The system was unable to install the <em>%component</em> component from the package, it requires a newer version of the H5P plugin. This site is currently running version %current, whereas the required version is %required or higher. You should consider upgrading and then try again.',
+                array(
+                  '%component' => (isset($h5pData['title']) ? $h5pData['title'] : $library_name),
+                  '%current' => H5PCore::$coreApi['majorVersion'] . '.' . H5PCore::$coreApi['minorVersion'],
+                  '%required' => $h5pData['coreApi']['majorVersion'] . '.' . $h5pData['coreApi']['minorVersion']
+                )
+            )
+        );
+
         $valid = false;
       }
     }
+
     return $valid;
   }
 
diff --git a/js/h5p-confirmation-dialog.js b/js/h5p-confirmation-dialog.js
index 15dd71e..84c8827 100644
--- a/js/h5p-confirmation-dialog.js
+++ b/js/h5p-confirmation-dialog.js
@@ -141,22 +141,24 @@ H5P.ConfirmationDialog = (function (EventDispatcher) {
     var wrapperElement;
 
     /**
-     * Append confirmation dialog
+     * Set parent of confirmation dialog
      * @param {HTMLElement} wrapper
      * @returns {H5P.ConfirmationDialog}
      */
     this.appendTo = function (wrapper) {
-      wrapper.appendChild(popupBackground);
       wrapperElement = wrapper;
-
       return this;
     };
 
     /**
      * Fit popup to container. Makes sure it doesn't overflow.
+     * @params {number} [offsetTop] Offset of popup
      */
-    var fitToContainer = function () {
+    var fitToContainer = function (offsetTop) {
       var popupOffsetTop = parseInt(popup.style.top, 10);
+      if (offsetTop) {
+        popupOffsetTop = offsetTop;
+      }
 
       // Overflows height
       if (popupOffsetTop + popup.offsetHeight > wrapperElement.offsetHeight) {
@@ -178,30 +180,28 @@ H5P.ConfirmationDialog = (function (EventDispatcher) {
      * @returns {H5P.ConfirmationDialog}
      */
     this.show = function (offsetTop) {
-      popup.style.top = offsetTop + 'px';
+      wrapperElement.appendChild(popupBackground);
       popupBackground.classList.remove('hidden');
-      fitToContainer();
+      fitToContainer(offsetTop);
       setTimeout(function () {
         popup.classList.remove('hidden');
         popupBackground.classList.remove('hiding');
 
-        // Resize iFrame if necessary
-        if (resizeIFrame && options.instance) {
-          setTimeout(function () {
+        setTimeout(function () {
+          // Focus confirm button
+          confirmButton.focus();
+
+          // Resize iFrame if necessary
+          if (resizeIFrame && options.instance) {
             var minHeight = parseInt(popup.offsetHeight, 10) +
               exitButtonOffset + (2 * shadowOffset);
             wrapperElement.style.minHeight = minHeight + 'px';
             options.instance.trigger('resize');
             resizeIFrame = false;
-          }, 100);
-        }
-
+          }
+        }, 100);
       }, 0);
 
-      // Programmatically focus popup
-      popup.setAttribute('tabindex', '-1');
-      popup.focus();
-
       return this;
     };
 
@@ -214,6 +214,7 @@ H5P.ConfirmationDialog = (function (EventDispatcher) {
       popup.classList.add('hidden');
       setTimeout(function () {
         popupBackground.classList.add('hidden');
+        wrapperElement.removeChild(popupBackground);
       }, 100);
 
       return this;