fix

backend/config/main.php

@@ -130,8 +130,6 @@ return [
             'showScriptName' => false,
 			'enableStrictParsing' => true,
             'rules' => [
-				'bids/bod-admin/download/<file>'		=> 'bids/bod-admin/download',
-
 				'<module_id>/settings/manage'		=> 'settings/manage',
 				'<module_id>/settings/create'		=> 'settings/create',
 				'<module_id>/settings/update/<id>'	=> 'settings/update',

common/modules/bids/controllers/BidAdminController.php

@@ -110,9 +110,9 @@ class BidAdminController extends AdminController
         return $this->redirect(['/bids/bid-admin/manage']);
     }
 
-    public function actionDownload($file)
+    public function actionDownload($id)
     {
-        $model = BidFile::find()->where(['filename' => $file])->one();
+        $model = BidFile::findOne($id);
         
         if($model) {
             return Yii::$app->response->sendFile(BidFile::path() . $model->filename, $model->filename);

common/modules/bids/models/BidFile.php

@@ -81,7 +81,7 @@ class BidFile extends \common\components\ActiveRecordModel
 
     public function getUrl()
     {
-        return Yii::$app->params['backUrl'] . '/bids/bid-admin/download/' . $this->filename;
+        return Yii::$app->params['backUrl'] . '/bids/bid-admin/download/' . $this->id;
     }
 
     public static function path()