diff --git a/spyder/plugins/application/container.py b/spyder/plugins/application/container.py
index 886e29da6c9..0207adcc923 100644
--- a/spyder/plugins/application/container.py
+++ b/spyder/plugins/application/container.py
@@ -94,7 +94,8 @@ def __init__(self, name, plugin, parent=None):
         # Keep track of dpi message
         self.current_dpi = None
         self.dpi_messagebox = None
-        # Keep track of downloaded installer executable for updates
+
+        # Keep track of the downloaded installer executable for updates
         self.installer_path = None
 
     # ---- PluginMainContainer API
@@ -232,6 +233,8 @@ def on_close(self):
         if self.dependencies_thread is not None:
             self.dependencies_thread.quit()
             self.dependencies_thread.wait()
+
+        # Run installer after Spyder is closed
         cmd = ('start' if os.name == 'nt' else 'open')
         if self.installer_path:
             subprocess.Popen(' '.join([cmd, self.installer_path]), shell=True)
diff --git a/spyder/plugins/application/widgets/install.py b/spyder/plugins/application/widgets/install.py
index 772f82c2468..95bfed5a9c4 100644
--- a/spyder/plugins/application/widgets/install.py
+++ b/spyder/plugins/application/widgets/install.py
@@ -141,7 +141,7 @@ class UpdateInstallerDialog(QDialog):
     Parameters
     ----------
     installer_path: str
-        Path to installer executable.
+        Path to the installer executable.
     """
 
     def __init__(self, parent):
@@ -150,6 +150,7 @@ def __init__(self, parent):
         self.download_thread = None
         self.download_worker = None
         self.installer_path = None
+
         super().__init__(parent)
         self.setWindowFlags(Qt.Dialog | Qt.MSWindowsFixedSizeDialogHint)
         self._parent = parent
@@ -181,7 +182,7 @@ def reject(self):
         if on_installation_widget:
             self.close_installer()
         else:
-            super(UpdateInstallerDialog, self).reject()
+            super().reject()
 
     def setup(self):
         """Setup visibility of widgets."""
@@ -192,7 +193,7 @@ def save_latest_release(self, latest_release_version):
         self.latest_release_version = latest_release_version
 
     def start_installation(self, latest_release_version):
-        """Start the update download and set downloading status."""
+        """Start downloading the update and set downloading status."""
         self.latest_release_version = latest_release_version
         self.cancelled = False
         self._change_update_installation_status(
@@ -249,11 +250,12 @@ def confirm_installation(self, installer_path):
             return
         self._change_update_installation_status(status=DOWNLOAD_FINISHED)
         self.installer_path = installer_path
-        msg_box = QMessageBox(icon=QMessageBox.Question,
-                              text=_("Would you like to proceed with the "
-                                     "installation?<br><br>"),
-                              parent=self._parent)
-        msg_box.setWindowTitle("Spyder")
+        msg_box = QMessageBox(
+            icon=QMessageBox.Question,
+            text=_("Would you like to proceed with the installation?<br><br>"),
+            parent=self._parent
+        )
+        msg_box.setWindowTitle(_("Spyder update"))
         msg_box.setAttribute(Qt.WA_ShowWithoutActivating)
         if is_pynsist():
             # Only add yes button for Windows installer
@@ -265,12 +267,15 @@ def confirm_installation(self, installer_path):
             _("After closing"), QMessageBox.YesRole)
         msg_box.addButton(QMessageBox.No)
         msg_box.exec_()
+
         if msg_box.clickedButton() == yes_button:
             self._change_update_installation_status(status=INSTALLING)
             cmd = ('start' if os.name == 'nt' else 'open')
             if self.installer_path:
                 subprocess.Popen(
-                    ' '.join([cmd, self.installer_path]), shell=True)
+                    ' '.join([cmd, self.installer_path]),
+                    shell=True
+                )
             self._change_update_installation_status(status=PENDING)
         elif msg_box.clickedButton() == after_closing_button:
             self.sig_install_on_close_requested.emit(self.installer_path)
@@ -285,8 +290,10 @@ def finish_installation(self):
 
     def close_installer(self):
         """Close the installation dialog."""
-        if (self.status == FINISHED
-                or self.status == CANCELLED):
+        if (
+            self.status == FINISHED
+            or self.status == CANCELLED
+        ):
             self.finish_installation()
         else:
             self.hide()
diff --git a/spyder/workers/updates.py b/spyder/workers/updates.py
index 87cc303c68e..02d2f46adee 100644
--- a/spyder/workers/updates.py
+++ b/spyder/workers/updates.py
@@ -185,8 +185,7 @@ def _download_installer(self):
             name = 'Spyder_64bit_{}.exe'.format('full' if is_full_installer
                                                 else 'lite')
         else:
-            name = 'Spyder{}.dmg'.format('' if is_full_installer
-                                            else '-Lite')
+            name = 'Spyder{}.dmg'.format('' if is_full_installer else '-Lite')
 
         url = ('https://github.com/spyder-ide/spyder/releases/latest/'
                f'download/{name}')
@@ -202,7 +201,7 @@ def _download_installer(self):
 
         installer_path = osp.join(installer_dir_path, name)
         self.installer_path = installer_path
-        if (not osp.isfile(installer_path)):
+        if not osp.isfile(installer_path):
             logger.debug(
                 f"Downloading installer from {url} to {installer_path}")
             urlretrieve(
@@ -222,10 +221,10 @@ def start(self):
         except HTTPError:
             error_msg = _('Unable to retrieve installer information.')
         except URLError:
-            error_msg = _('Unable to connect to the internet. <br><br>Make '
-                          'sure the connection is working properly.')
+            error_msg = _('Unable to connect to the internet. <br><br>'
+                          'Make sure the connection is working properly.')
         except Exception:
-            error_msg = _('Unable to download installer.')
+            error_msg = _('Unable to download the installer.')
         self.error = error_msg
         try:
             self.sig_ready.emit(self.installer_path)