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Old 02-11-2026, 01:16 AM   #16
BetterRed
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What happens of you don't do a restart - will calibre run, and is it the new version? When it's happened to me I've ignored the message, and carried on regardless… with no known side effects.

BR
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Old 02-11-2026, 04:42 AM   #17
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What happens of you don't do a restart - will calibre run, and is it the new version? When it's happened to me I've ignored the message, and carried on regardless… with no known side effects.

BR
I've never tried. Too docilely obedient, I guess
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Old 02-12-2026, 07:21 AM   #18
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I can confirm that calibre 9 does not always shut down cleanly. Calibre itself is not bothered by it, but as is to be expected an install is; I found out when updating a portable install and the installer complained that calibre was running.

I haven't been able to figure out yet what triggers it.
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Old 02-12-2026, 07:34 AM   #19
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I can confirm that calibre 9 does not always shut down cleanly. Calibre itself is not bothered by it, but as is to be expected an install is; I found out when updating a portable install and the installer complained that calibre was running.

I haven't been able to figure out yet what triggers it.
I've not had a problem which any of the beta versions (portable) or the release versions shutting down completely with Windows 11.
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Old 02-12-2026, 07:50 AM   #20
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I've not had a problem which any of the beta versions (portable) or the release versions shutting down completely with Windows 11.
It may well be something on my system (Win11 Home 25H2 build 26200.7840) that's triggering it. When it's triggered, because it doesn't always do so.
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Old 02-12-2026, 07:57 AM   #21
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I've not had a problem which any of the beta versions (portable) or the release versions shutting down completely with Windows 11.
Ditto.
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Old 02-12-2026, 11:42 AM   #22
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It might be worthwhile using one of SysInternals tools (especially ProcessMonitor) to ensure that all calibre processes have terminated. I know at times I've sent instances of a calibre subtask remain active after the main program has ended. If any are seen then just right click on the process and select the kill option.

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Old 02-16-2026, 03:12 PM   #23
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I frequently had this same problem. Turns out I always had a book open to read it while the update was occurring.
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Old Yesterday, 04:34 AM   #24
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Yeah, it happens to me from time to time when I forget to close Calibre. Pretty annoying but that how windows handle updating a running program.

However, the next release/installer will contain some warning if the installer detect that Calibre is still running, and will give the user the opportunity to close the program before continuing and having an unexpected reboot.

https://github.com/kovidgoyal/calibr...d2e8bd33132ce1

thanks Kovid
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Old Yesterday, 10:18 PM   #25
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Originally Posted by un_pogaz View Post
Yeah, it happens to me from time to time when I forget to close Calibre. Pretty annoying but that how windows handle updating a running program.

However, the next release/installer will contain some warning if the installer detect that Calibre is still running, and will give the user the opportunity to close the program before continuing and having an unexpected reboot.

https://github.com/kovidgoyal/calibr...d2e8bd33132ce1

thanks Kovid
I hope that also applies to the portable version as well.
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Old Today, 12:01 AM   #26
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The portable installer already had the check, though I have improved it somewhat to add a retry button and check for more process names.
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