New install Of 8.0.1.0 fails to start windows 11

[DaedalusWren]

I couldn't get the new version to update until I did it through Admin command line. Then it would not run.I uninstalled the program and installed the 8.0.1.0 without issue, but the program still will not start.
Used the command line with calibre-debug -g and received the following.
Since I saw a python error, I tried updating to the newest stable version of python 3.13.2, to no avail.
Any and all help would be appreciated.

C:\Windows\System32>calibre-debug -g
calibre 8.0.1 embedded-python: True
Windows-10-10.0.22631-SP0 Windows ('64bit', 'WindowsPE')
('Windows', '10', '10.0.22631')
Python 3.11.5
Windows: ('10', '10.0.22631', 'SP0', 'Multiprocessor Free')
Interface language: None
EXE path: G:\Program Files\Calibre2\calibre-debug.exe
Successfully initialized third party plugins: DeDRM (7, 2, 1) && Kobo Books (1, 9, 0) && Kobo Utilities (2, 19, 1)
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 241, in main
File "calibre\gui_launch.py", line 73, in calibre
File "bypy-importer.py", line 279, in exec_module
File "calibre\gui2\main.py", line 11, in <module>
ImportError: Module use of python38.dll conflicts with this version of Python.

[kovidgoyal]

Uninstall, delete C:\Program Files\Calibre2
(or wherever you chose to install calibre). Then re-install. And
dont worry, uninstalling will not affect your books/settings/plugins.

[DaedalusWren]

Wow,, thank you very much. Works fine now. Cheers.

[kck]

Sorry to say that I have the same problem. Uninstalling, removing directory "calibre2", and reinstalling did not help. This is a machine with "Microsoft Windows Server 2016 Standard" as operating system. Output of calibre-debug is appended below. Will return to Calibre 7.26 now, but would very much like to be able to update. Thank you for any time you can invest in looking at this issue.

KCK

>calibre-debug -g
calibre 8.0.1 embedded-python: True
Windows-10-10.0.14393-SP0 Windows ('64bit', 'WindowsPE')
('Windows', '10', '10.0.14393')
Python 3.11.5
Windows: ('10', '10.0.14393', 'SP0', 'Multiprocessor Free')
Interface language: de
EXE path: C:\Program Files\Calibre2\calibre-debug.exe
Failed to import PyQt module: PyQt6.QtWidgets with error: DLL load failed while importing QtWidgets: Die angegebene Prozedur wurde nicht gefunden.
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 241, 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)

[kovidgoyal]

That's the Qt DLL failing to load, probably some missing DLL on your machine given how old the version of windows is. Sadly there is no easy way on windows to find which DLL is missing, you can try the dll depends tool

[JSWolf]

Originally Posted by kck

Sorry to say that I have the same problem. Uninstalling, removing directory "calibre2", and reinstalling did not help. This is a machine with "Microsoft Windows Server 2016 Standard" as operating system. Output of calibre-debug is appended below. Will return to Calibre 7.26 now, but would very much like to be able to update. Thank you for any time you can invest in looking at this issue.

KCK

>calibre-debug -g
calibre 8.0.1 embedded-python: True
Windows-10-10.0.14393-SP0 Windows ('64bit', 'WindowsPE')
('Windows', '10', '10.0.14393')
Python 3.11.5
Windows: ('10', '10.0.14393', 'SP0', 'Multiprocessor Free')
Interface language: de
EXE path: C:\Program Files\Calibre2\calibre-debug.exe
Failed to import PyQt module: PyQt6.QtWidgets with error: DLL load failed while importing QtWidgets: Die angegebene Prozedur wurde nicht gefunden.
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 241, 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)

Given that your Windows 10 is seriously out-of-date, I suggest you upgrade to the latest Windows 10 and then try calibre 8.0.1 again. There have been instances where QT does not work on such an old version of Windows 10.

[DNSB]

Originally Posted by kck

calibre-debug -g
calibre 8.0.1  embedded-python: True
Windows-10-10.0.14393-SP0 Windows ('64bit', 'WindowsPE')
('Windows', '10', '10.0.14393')
Python 3.11.5
Windows: ('10', '10.0.14393', 'SP0', 'Multiprocessor Free')

Is there a reason that you are still running Windows 10 build 1607 AKA Anniversary Update? That version was released in August, 2016 and went end of life in April, 2018 (April, 2019 for Enterprise and Education). If your hardware supports it, can you try running Windows Update and updating to the latest build your computer will support.

[shauntih]

Uninstalling the install directory and reinstalling fixed my issue as well!

[mbovenka]

Originally Posted by DNSB

Is there a reason that you are still running Windows 10 build 1607 AKA Anniversary Update? That version was released in August, 2016 and went end of life in April, 2018 (April, 2019 for Enterprise and Education). If your hardware supports it, can you try running Windows Update and updating to the latest build your computer will support.

He is running Server 2016 for whatever reason.

[JSWolf]

Originally Posted by mbovenka

He is running Server 2016 for whatever reason.

Exactly. This is why he needs to update to the latest Windows 10 unless his computer is able to run Windows 11.

[DNSB]

Perhaps he is running a domain controller or other server items on the computer? Though it's generally recommended that domain controllers be dedicated machines. Mine lives on a VM.

Can you give us the build level of your 2016 server (should look something like 14393.7876 for the full string)?

[JSWolf]

Originally Posted by DNSB

Perhaps he is running a domain controller or other server items on the computer? Though it's generally recommended that domain controllers be dedicated machines. Mine lives on a VM.

Can you give us the build level of your 2016 server (should look something like 14393.7876 for the full string)?

It could be that the version of QT being used needs a newer Windows 10. We've seen this before with Windows 10 with someone else on MR.

[kck]

Many thanks for the advice. The build level appears to be "10.0.14393.5786" as far as I can tell. I have asked the people in charge of this server whether they are willing to update (to a later version of Windows 10 or to Windows 11). The machine is certainly powerful enough, but moving to Windows 11 may be associated with costs for the system adminstrators.

KCK

[DNSB]

As a retired sytem administrator, I would be tempted to say to say "Get off of my server!".

Sorry but it's unlikely that a wipe and reinstall is going to be done to keep a user happy. The upgrade path from Server 2016 is to Server 2025 not to Windows 11.