diff --git a/admin/renderer.php b/admin/renderer.php
index 6b2e0257942..f4f55b5c7de 100644
--- a/admin/renderer.php
+++ b/admin/renderer.php
@@ -1616,12 +1616,18 @@ class core_admin_renderer extends plugin_renderer_base {
 
         $plugininfo = $pluginman->get_plugins();
 
-        $numtotal = $numextension = $numupdatable = 0;
+        $numtotal = $numextension = $numupdatable = $numinstallable = 0;
 
         foreach ($plugininfo as $type => $plugins) {
             foreach ($plugins as $name => $plugin) {
-                if ($plugin->available_updates()) {
+                if ($res = $plugin->available_updates()) {
                     $numupdatable++;
+                    foreach ($res as $updateinfo) {
+                        if ($pluginman->is_remote_plugin_installable($updateinfo->component, $updateinfo->version, $reason, false)) {
+                            $numinstallable++;
+                            break;
+                        }
+                    }
                 }
                 if ($plugin->get_status() === core_plugin_manager::PLUGIN_STATUS_MISSING) {
                     continue;
@@ -1664,16 +1670,13 @@ class core_admin_renderer extends plugin_renderer_base {
             $out .= $this->output->heading(get_string('overviewext', 'core_plugin'), 3);
         }
 
-        if ($numupdatable) {
-            $installableupdates = $pluginman->filter_installable($pluginman->available_updates());
-            if ($installableupdates) {
-                $out .= $this->output->single_button(
-                    new moodle_url($this->page->url, array('installupdatex' => 1)),
-                    get_string('updateavailableinstallall', 'core_admin', count($installableupdates)),
-                    'post',
-                    array('class' => 'singlebutton updateavailableinstallall')
-                );
-            }
+        if ($numinstallable) {
+            $out .= $this->output->single_button(
+                new moodle_url($this->page->url, array('installupdatex' => 1)),
+                get_string('updateavailableinstallall', 'core_admin', $numinstallable),
+                'post',
+                array('class' => 'singlebutton updateavailableinstallall')
+            );
         }
 
         $out .= html_writer::div($infoall, 'info info-all').
@@ -1907,7 +1910,7 @@ class core_admin_renderer extends plugin_renderer_base {
             'infos'
         );
 
-        if ($pluginman->is_remote_plugin_installable($updateinfo->component, $updateinfo->version, $reason)) {
+        if ($pluginman->is_remote_plugin_installable($updateinfo->component, $updateinfo->version, $reason, false)) {
             $box .= $this->output->single_button(
                 new moodle_url($this->page->url, array('installupdate' => $updateinfo->component,
                     'installupdateversion' => $updateinfo->version)),
diff --git a/lib/classes/plugin_manager.php b/lib/classes/plugin_manager.php
index 8de966b2790..e64dd99f244 100644
--- a/lib/classes/plugin_manager.php
+++ b/lib/classes/plugin_manager.php
@@ -1002,9 +1002,10 @@ class core_plugin_manager {
      * @param string $component
      * @param int $version version number
      * @param string $reason returned code of the reason why it is not
+     * @param bool $checkremote check this version availability on moodle server
      * @return boolean
      */
-    public function is_remote_plugin_installable($component, $version, &$reason=null) {
+    public function is_remote_plugin_installable($component, $version, &$reason = null, $checkremote = true) {
         global $CFG;
 
         // Make sure the feature is not disabled.
@@ -1014,7 +1015,7 @@ class core_plugin_manager {
         }
 
         // Make sure the version is available.
-        if (!$this->is_remote_plugin_available($component, $version, true)) {
+        if ($checkremote && !$this->is_remote_plugin_available($component, $version, true)) {
             $reason = 'remoteunavailable';
             return false;
         }
@@ -1026,12 +1027,17 @@ class core_plugin_manager {
             return false;
         }
 
-        $remoteinfo = $this->get_remote_plugin_info($component, $version, true);
+        if (!$checkremote) {
+            $remoteversion = $version;
+        } else {
+            $remoteinfo = $this->get_remote_plugin_info($component, $version, true);
+            $remoteversion = $remoteinfo->version->version;
+        }
         $localinfo = $this->get_plugin_info($component);
 
         if ($localinfo) {
             // If the plugin is already present, prevent downgrade.
-            if ($localinfo->versiondb > $remoteinfo->version->version) {
+            if ($localinfo->versiondb > $remoteversion) {
                 $reason = 'cannotdowngrade';
                 return false;
             }