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Old 07-08-2025, 07:12 AM   #1
Giuseppe Chillem
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Calibre doesn't open on this machine
I have installed Calibre 8.40 and other versions on a updated Windows 10 LTS 1607 with all patches but it does not start anymore. No signal of any type. I have rebooted, reinstalled tried from CMD but nothing!

I have also unistalled Calibre, deleted the installation folder, rebooted and started again with no success.

Here is the debug output
What should I do now?
Spoiler:
Code:
calibre 8.4 embedded-python: True
Windows-10-10.0.14393-SP0 Windows ('64bit', 'WindowsPE')
('Windows', '10', '10.0.14393')
Python 3.11.12
Windows: ('10', '10.0.14393', 'SP0', 'Multiprocessor Free')
Interface language: it
EXE path: C:\Program Files\Calibre2\calibre-debug.exe
Failed to import PyQt module: PyQt6.QtWidgets with error: DLL load failed while importing QtWidgets: Impossibile trovare la procedura specificata.
Traceback (most recent call last):
File "runpy.py", line 198, in _run_module_as_main
File "runpy.py", line 88, in _run_code
File "site.py", line 83, in <module>
File "site.py", line 78, in main
File "site.py", line 50, in run_entry_point
File "calibre\debug.py", line 234, in main
File "calibre\gui_launch.py", line 72, in calibre
File "calibre\gui_launch.py", line 51, in register_with_default_programs
File "bypy-importer.py", line 279, in exec_module
File "calibre\gui2\__init__.py", line 15, in <module>
ImportError: cannot import name 'QApplication' from 'qt.core' (C:\Program Files\Calibre2\app\bin\python-lib.bypy.frozen\qt\core.pyc)
Last edited by chaley; 07-08-2025 at 07:44 AM. Reason: Cleaned up log file and put it behind a spoiler
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Old 07-08-2025, 07:50 AM   #2
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that's an error loading a DLL, try rebooting in safe mode in case its caused by some program interfering.
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Old 07-16-2025, 09:02 PM   #3
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Quote:
Originally Posted by kovidgoyal View Post
that's an error loading a DLL, try rebooting in safe mode in case its caused by some program interfering.
I have rebooted in safe mode and tried to start Calibre with no luck, it does not open.
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Old 07-16-2025, 11:05 PM   #4
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Hmmm no clue then, is this specific to 8.x? Try uninstalling and installing the last 7.x version instead from https://download.calibre-ebook.com/
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Old 07-16-2025, 11:17 PM   #5
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Quote:
Originally Posted by Giuseppe Chillem View Post
I have rebooted in safe mode and tried to start Calibre with no luck, it does not open.
Before going back to the latest version 7, try the latest version 8 and see what happens.
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Old 07-17-2025, 07:01 AM   #6
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Before going back to the latest version 7, try the latest version 8 and see what happens.
I have already tried with no success.
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Old 07-17-2025, 07:11 AM   #7
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Originally Posted by kovidgoyal View Post
Hmmm no clue then, is this specific to 8.x? Try uninstalling and installing the last 7.x version instead from https://download.calibre-ebook.com/
I have done it and Calibre starts. Version 7.0.0 here
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Old 07-17-2025, 08:14 AM   #8
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Quote:
Originally Posted by kovidgoyal View Post
Hmmm no clue then, is this specific to 8.x? Try uninstalling and installing the last 7.x version instead from https://download.calibre-ebook.com/
I have tested from version 7.0.0 and upward. It works up to 7.26.0. Version 8.0.0 does not work.
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Old 07-17-2025, 08:20 AM   #9
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Originally Posted by Giuseppe Chillem View Post
I have tested from version 7.0.0 and upward. It works up to 7.26.0. Version 8.0.0 does not work.
Now try installing the portable version of calibre 8 (latest version) and see how it goes.
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Old 07-17-2025, 09:12 AM   #10
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Now try installing the portable version of calibre 8 (latest version) and see how it goes.
No luck, it does not start
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Old 07-17-2025, 09:24 AM   #11
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Perhaps a windows system file check would fix things.
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Old 07-17-2025, 11:53 AM   #12
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Perhaps a windows system file check would fix things.
I have done what you have suggested with no success, Calibre does not open.
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Old 07-17-2025, 05:31 PM   #13
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Unfortunately, Qt6.9 requires Windows 10 (version 1809 or later) or Windows 11.
Seems you're stuck with Calibre 7.26.0.
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Old 07-17-2025, 06:32 PM   #14
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Unfortunately, Qt6.9 requires Windows 10 (version 1809 or later) or Windows 11.
Seems you're stuck with Calibre 7.26.0.
So we have found the source of the problem.
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Old 07-17-2025, 06:54 PM   #15
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Out of curiosity, why are you still using that antique version of Windows 10? Unless you have purchased the extended support which would expire in Oct. 2026, you are long out of support since the standard support expired in Oct. 2021.
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