I am experiencing an issue while trying to sync my AnKing Step Deck with AnkiHub. The system shows the deck as if it were not installed, even though it is present in my collection. When I attempt to sync manually, I receive an error message and the synch

🐛 Bug
1

Before the error happened, I was…
[Replace this text.]

Error message (don't change this) 
Anki 25.09.2 (3890e12c) (ao)
Python 3.13.5 Qt 6.9.1 PyQt 6.9.1
Platform: Windows-11-10.0.26200-SP0

Traceback (most recent call last):

  File "C:\Users\LENOVO\AppData\Roaming\Anki2\addons21\1322529746\gui\operations\deck_installation.py", line 193, in _download_and_install_decks_inner
    _download_and_install_single_deck(
    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^
        deck,
        ^^^^^
        behavior_on_remote_note_deleted=behavior_on_remote_note_deleted,
        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
        recommended_deck_settings=recommended_deck_settings,
        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    )
    ^

  File "C:\Users\LENOVO\AppData\Roaming\Anki2\addons21\1322529746\gui\operations\deck_installation.py", line 220, in _download_and_install_single_deck
    notes_data: List[NoteInfo] = AnkiHubClient().download_deck(
                                 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^
        deck.ah_did, download_progress_cb=deck_download_progress_cb
        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    )
    ^

  File "C:\Users\LENOVO\AppData\Roaming\Anki2\addons21\1322529746\ankihub_client\ankihub_client.py", line 637, in download_deck
    deck_csv_content = gzip.decompress(s3_response_content).decode("utf-8")
                       ~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^

  File "C:\Users\LENOVO\AppData\Local\AnkiProgramFiles\python\cpython-3.13.5-windows-x86_64-none\Lib\gzip.py", line 635, in decompress
    raise BadGzipFile("CRC check failed")

gzip.BadGzipFile: CRC check failed


The above exception was the direct cause of the following exception:


Traceback (most recent call last):

  File "C:\Users\LENOVO\AppData\Local\AnkiProgramFiles\.venv\Lib\site-packages\aqt\taskman.py", line 152, in raise_exception
    raise exception

  File "C:\Users\LENOVO\AppData\Local\AnkiProgramFiles\.venv\Lib\site-packages\aqt\taskman.py", line 148, in _on_closures_pending
    closure()
    ~~~~~~~^^

  File "C:\Users\LENOVO\AppData\Roaming\Anki2\addons21\1322529746\gui\decks_dialog.py", line 276, in on_done
    future.result()
    ~~~~~~~~~~~~~^^

  File "C:\Users\LENOVO\AppData\Local\AnkiProgramFiles\python\cpython-3.13.5-windows-x86_64-none\Lib\concurrent\futures\_base.py", line 449, in result
    return self.__get_result()
           ~~~~~~~~~~~~~~~~~^^

  File "C:\Users\LENOVO\AppData\Local\AnkiProgramFiles\python\cpython-3.13.5-windows-x86_64-none\Lib\concurrent\futures\_base.py", line 401, in __get_result
    raise self._exception

  File "C:\Users\LENOVO\AppData\Roaming\Anki2\addons21\1322529746\gui\operations\utils.py", line 36, in wrapper
    return func(*args, **kwargs)

  File "C:\Users\LENOVO\AppData\Roaming\Anki2\addons21\1322529746\gui\operations\ankihub_sync.py", line 120, in _on_new_deck_subscriptions_done
    future.result()
    ~~~~~~~~~~~~~^^

  File "C:\Users\LENOVO\AppData\Local\AnkiProgramFiles\python\cpython-3.13.5-windows-x86_64-none\Lib\concurrent\futures\_base.py", line 449, in result
    return self.__get_result()
           ~~~~~~~~~~~~~~~~~^^

  File "C:\Users\LENOVO\AppData\Local\AnkiProgramFiles\python\cpython-3.13.5-windows-x86_64-none\Lib\concurrent\futures\_base.py", line 401, in __get_result
    raise self._exception

  File "C:\Users\LENOVO\AppData\Roaming\Anki2\addons21\1322529746\gui\operations\utils.py", line 36, in wrapper
    return func(*args, **kwargs)

  File "C:\Users\LENOVO\AppData\Roaming\Anki2\addons21\1322529746\gui\operations\deck_installation.py", line 90, in _on_install_done
    import_results: List[AnkiHubImportResult] = future.result()
                                                ~~~~~~~~~~~~~^^

  File "C:\Users\LENOVO\AppData\Local\AnkiProgramFiles\python\cpython-3.13.5-windows-x86_64-none\Lib\concurrent\futures\_base.py", line 449, in result
    return self.__get_result()
           ~~~~~~~~~~~~~~~~~^^

  File "C:\Users\LENOVO\AppData\Local\AnkiProgramFiles\python\cpython-3.13.5-windows-x86_64-none\Lib\concurrent\futures\_base.py", line 401, in __get_result
    raise self._exception

  File "C:\Users\LENOVO\AppData\Local\AnkiProgramFiles\python\cpython-3.13.5-windows-x86_64-none\Lib\concurrent\futures\thread.py", line 59, in run
    result = self.fn(*self.args, **self.kwargs)

  File "C:\Users\LENOVO\AppData\Roaming\Anki2\addons21\1322529746\gui\operations\deck_installation.py", line 78, in <lambda>
    task=lambda: _download_and_install_decks_inner(
                 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^
        decks,
        ^^^^^^
        behavior_on_remote_note_deleted=behavior_on_remote_note_deleted,
        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
        recommended_deck_settings=recommended_deck_settings,
        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    ),
    ^

  File "C:\Users\LENOVO\AppData\Roaming\Anki2\addons21\1322529746\gui\operations\deck_installation.py", line 210, in _download_and_install_decks_inner
    raise exceptions[0]

1322529746.gui.exceptions.DeckDownloadAndInstallError: Error while downloading and installing deck e77aedfe-a636-40e2-8169-2fce2673187e: CRC check failed

Sentry link (for developers)

2

The deck is apparently getting corrupted on download. Do you have any VPN/firewall software running? If that’s not the case, you might want to test with a different network to narrow down the source of the issue.