diff --git a/modules/system/classes/UpdateManager.php b/modules/system/classes/UpdateManager.php
index 5831a1e32..e07dc043a 100644
--- a/modules/system/classes/UpdateManager.php
+++ b/modules/system/classes/UpdateManager.php
@@ -557,12 +557,16 @@ class UpdateManager
      * Downloads a plugin from the update server.
      * @param string $name Plugin name.
      * @param string $hash Expected file hash.
+     * @param boolean $installation Indicates whether this is a plugin installation request.
      * @return self
      */
-    public function downloadPlugin($name, $hash)
+    public function downloadPlugin($name, $hash, $installation = false)
     {
         $fileCode = $name . $hash;
-        $this->requestServerFile('plugin/get', $fileCode, $hash, ['name' => $name]);
+        $this->requestServerFile('plugin/get', $fileCode, $hash, [
+            'name' => $name,
+            'installation' => $installation ? 1 : 0
+        ]);
     }
 
     /**
@@ -909,7 +913,13 @@ class UpdateManager
      */
     protected function applyHttpAttributes($http, $postData)
     {
-        $postData['server'] = base64_encode(serialize(['php' => PHP_VERSION, 'url' => Url::to('/')]));
+        $postData['protocol_version'] = '1.1';
+
+        $postData['server'] = base64_encode(serialize([
+            'php'   => PHP_VERSION,
+            'url'   => Url::to('/'),
+            'since' => PluginVersion::orderBy('created_at')->value('created_at')
+        ]));
 
         if ($projectId = Parameter::get('system::project.id')) {
             $postData['project'] = $projectId;
diff --git a/modules/system/console/PluginInstall.php b/modules/system/console/PluginInstall.php
index 4b7420a79..6a3264d59 100644
--- a/modules/system/console/PluginInstall.php
+++ b/modules/system/console/PluginInstall.php
@@ -43,7 +43,7 @@ class PluginInstall extends Command
         $hash = array_get($pluginDetails, 'hash');
 
         $this->output->writeln(sprintf('<info>Downloading plugin: %s</info>', $code));
-        $manager->downloadPlugin($code, $hash);
+        $manager->downloadPlugin($code, $hash, true);
 
         $this->output->writeln(sprintf('<info>Unpacking plugin: %s</info>', $code));
         $manager->extractPlugin($code, $hash);
diff --git a/modules/system/controllers/Updates.php b/modules/system/controllers/Updates.php
index 3f67d2cdd..8f0aaf12f 100644
--- a/modules/system/controllers/Updates.php
+++ b/modules/system/controllers/Updates.php
@@ -279,7 +279,7 @@ class Updates extends Controller
                 break;
 
             case 'downloadPlugin':
-                $manager->downloadPlugin(post('name'), post('hash'));
+                $manager->downloadPlugin(post('name'), post('hash'), post('install'));
                 break;
 
             case 'downloadTheme':
@@ -439,7 +439,7 @@ class Updates extends Controller
             /*
              * Update steps
              */
-            $updateSteps = $this->buildUpdateSteps($core, $plugins, $themes);
+            $updateSteps = $this->buildUpdateSteps($core, $plugins, $themes, false);
 
             /*
              * Finish up
@@ -534,7 +534,7 @@ class Updates extends Controller
             /*
              * Update steps
              */
-            $updateSteps = $this->buildUpdateSteps($core, $plugins, $themes);
+            $updateSteps = $this->buildUpdateSteps($core, $plugins, $themes, false);
 
             /*
              * Finish up
@@ -553,7 +553,7 @@ class Updates extends Controller
         return $this->makePartial('execute');
     }
 
-    protected function buildUpdateSteps($core, $plugins, $themes)
+    protected function buildUpdateSteps($core, $plugins, $themes, $isInstallationRequest)
     {
         if (!is_array($core)) {
             $core = [null, null];
@@ -595,7 +595,8 @@ class Updates extends Controller
                 'code'  => 'downloadPlugin',
                 'label' => Lang::get('system::lang.updates.plugin_downloading', compact('name')),
                 'name'  => $name,
-                'hash'  => $hash
+                'hash'  => $hash,
+                'install' => $isInstallationRequest ? 1 : 0
             ];
         }
 
@@ -717,7 +718,7 @@ class Updates extends Controller
             /*
              * Update steps
              */
-            $updateSteps = $this->buildUpdateSteps(null, $plugins, []);
+            $updateSteps = $this->buildUpdateSteps(null, $plugins, [], true);
 
             /*
              * Finish up
@@ -845,7 +846,7 @@ class Updates extends Controller
             /*
              * Update steps
              */
-            $updateSteps = $this->buildUpdateSteps(null, $plugins, $themes);
+            $updateSteps = $this->buildUpdateSteps(null, $plugins, $themes, true);
 
             /*
              * Finish up