diff --git a/attachment_zipped_download/__manifest__.py b/attachment_zipped_download/__manifest__.py
index ab7a08db..948bd443 100644
--- a/attachment_zipped_download/__manifest__.py
+++ b/attachment_zipped_download/__manifest__.py
@@ -2,7 +2,7 @@
 # License AGPL-3.0 or later (https://www.gnu.org/licenses/agpl).
 {
     "name": "Attachment Zipped Download",
-    "version": "16.0.1.0.1",
+    "version": "12.0.1.0.1",
     "category": "Tools",
     "website": "https://github.com/OCA/knowledge",
     "author": "Tecnativa, Odoo Community Association (OCA)",
diff --git a/attachment_zipped_download/models/ir_attachment.py b/attachment_zipped_download/models/ir_attachment.py
index 1f58adad..a39bac64 100644
--- a/attachment_zipped_download/models/ir_attachment.py
+++ b/attachment_zipped_download/models/ir_attachment.py
@@ -4,13 +4,14 @@
 import zipfile
 from io import BytesIO
 
-from odoo import _, models
+from odoo import _, api, models
 from odoo.exceptions import UserError
 
 
 class IrAttachment(models.Model):
     _inherit = "ir.attachment"
 
+    @api.multi
     def action_attachments_download(self):
         items = self.filtered(lambda x: x.type == "binary")
         if not items:
diff --git a/attachment_zipped_download/tests/test_attachment_zipped_download.py b/attachment_zipped_download/tests/test_attachment_zipped_download.py
index 84a8910e..375ffc1b 100644
--- a/attachment_zipped_download/tests/test_attachment_zipped_download.py
+++ b/attachment_zipped_download/tests/test_attachment_zipped_download.py
@@ -18,6 +18,7 @@ class TestAttachmentZippedDownload(odoo.tests.HttpCase):
         self.user = new_test_user(
             self.env,
             login="test-user",
+            password="test-user",
             context=ctx,
         )
         test_1 = self._create_attachment(self.user, "test1.txt")
@@ -27,7 +28,7 @@ class TestAttachmentZippedDownload(odoo.tests.HttpCase):
     def _create_attachment(self, user, name):
         return (
             self.env["ir.attachment"]
-            .with_user(user)
+            .sudo(user)
             .create(
                 {
                     "name": name,