diff --git a/src/gui_qt/lib/utils.py b/src/gui_qt/lib/utils.py
index 768b848..436e656 100644
--- a/src/gui_qt/lib/utils.py
+++ b/src/gui_qt/lib/utils.py
@@ -1,6 +1,5 @@
 from __future__ import annotations
 
-import sys
 from functools import lru_cache
 from os import getenv, stat
 from os.path import exists
@@ -116,28 +115,28 @@ class UpdateDialog(QtWidgets.QDialog):
         # Download zsync file of latest Appimage, look for SHA-1 hash and compare with hash of AppImage
         is_updateble, m_time_file, m_time_zsync = self.updater.get_update_information(filename)
 
-        if m_time_zsync is None:
-            label_text = '<p>Retrieval of version information failed.</p>' \
-                         '<p>Please try later (or complain to people that it does not work).</p>'
+        label_text = ''
+
+        if is_updateble is None:
+            label_text += '<p>Could not determine if this version is newer, please update manually (if necessary).</p>'
             dialog_bttns = QtWidgets.QDialogButtonBox.Close
+        elif is_updateble:
+            label_text += '<p>Newer version available. Press Ok to download new version, Cancel to ignore.</p>'
+            dialog_bttns = QtWidgets.QDialogButtonBox.Ok | QtWidgets.QDialogButtonBox.Cancel
         else:
-            label_text = f'<p>Date of most recent AppImage: {m_time_zsync.strftime("%d %B %Y %H:%M")}</p>'
+            label_text += '<p>Version may be already up-to-date.</p>'
+            dialog_bttns = QtWidgets.QDialogButtonBox.Close
 
-            if m_time_file is None:
-                label_text += 'No AppImage file found, press Ok to download latest version.'
-                dialog_bttns = QtWidgets.QDialogButtonBox.Ok|QtWidgets.QDialogButtonBox.Close
-            else:
-                label_text += f'<p>Date of used AppImage: {m_time_file.strftime("%d %B %Y %H:%M")}</p>'
+        if m_time_zsync is None:
+            label_text += '<p>Creation date of remote version is unknown.</p>'
+        else:
+            label_text += f'<p>Date of most recent AppImage: {m_time_zsync.strftime("%d %B %Y %H:%M")}</p>'
 
-                if is_updateble is None:
-                    self.status.setText('Could not determine if this version is newer, please update manually (if necessary).')
-                    dialog_bttns = QtWidgets.QDialogButtonBox.Close
-                elif is_updateble:
-                    self.status.setText(f'<p>Newer version available. Press Ok to download new version, Cancel to ignore.')
-                    dialog_bttns = QtWidgets.QDialogButtonBox.Ok|QtWidgets.QDialogButtonBox.Cancel
-                else:
-                    self.status.setText(f'Version may be already up-to-date.')
-                    dialog_bttns = QtWidgets.QDialogButtonBox.Close
+        if m_time_file is None:
+            label_text += 'No AppImage file found, press Ok to download latest version.'
+            dialog_bttns = QtWidgets.QDialogButtonBox.Ok | QtWidgets.QDialogButtonBox.Close
+        else:
+            label_text += f'<p>Date of used AppImage: {m_time_file.strftime("%d %B %Y %H:%M")}</p>'
 
         self.label.setText(label_text)
         self.dialog_button.setStandardButtons(dialog_bttns)
@@ -241,8 +240,13 @@ class Updater:
             for line in zsync_file.split(b'\n'):
                 try:
                     kw, val = line.split(b': ')
+                    time_string = str(val, encoding='utf-8')
+                    time_format = '%a, %d %b %Y %H:%M:%S %z'
                     if kw == b'MTime':
-                        m_time_zsync = datetime.strptime(str(val, encoding='utf-8'), '%a, %d %b %Y %H:%M:%S %z').astimezone(None)
+                        try:
+                            m_time_zsync = datetime.strptime(time_string, time_format).astimezone(None)
+                        except ValueError:
+                            logger.warning(f'zsync time "{time_string}" does not match "{time_format}"')
                     elif kw == b'SHA-1':
                         checksum_zsync = str(val, encoding='utf-8')
                     elif kw == b'Filename':
@@ -277,7 +281,7 @@ class Updater:
         m_time_file, checksum_file = Updater.get_appimage_info(filename)
 
         logger.info(f'zsync information {m_time_zsync}, {checksum_zsync}, {appname}')
-        logger.info(f'file information {m_time_file}, {checksum_zsync}')
+        logger.info(f'file information {m_time_file}, {checksum_file}')
 
         if not ((checksum_file is not None) and (checksum_zsync is not None)):
             return None, m_time_file, m_time_zsync