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Old 08-04-2025, 06:25 PM   #1
NugentS
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Unable to upgrade Calibre
Hi,

Whenever I try to install Calibre I get the following attached:

It says error 2503 (The installer has encountered an unexpected error)

Calibre (the installed version works), but I cannot upgrade

Any thoughts?
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Old 08-04-2025, 06:31 PM   #2
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What happens if you do an uninstall and then reinstall? Calibre settings will remain after an uninstall.
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Old 08-04-2025, 07:50 PM   #3
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I was hoping to avoid an uninstall as the current version works and I have a fair degree of customisation.

Really - the customeisation remains if I uninstall and re-install?
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Old 08-04-2025, 08:23 PM   #4
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The 2503 error during an install is most often triggered by rights issues on the Temp folder.
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Old 08-04-2025, 09:11 PM   #5
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Uninstall (the standard Windows one) does not remove any settings or Libraries
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Old Yesterday, 02:15 AM   #6
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Quote:
Originally Posted by DNSB View Post
The 2503 error during an install is most often triggered by rights issues on the Temp folder.
It can be. It's more often triggered by failed synchronization of MSI (the Microsoft Installer, a part of Windows — and the program that actually does upgrades for Calibre, Office, and many other Windows executables). Fortunately, resynching is relatively easy, but it does involve a reboot.

Close all programs (that means the browser, too, so you're going to want to copy the following down first!). Open a command line in administrator mode (Win-S, search for "command," select "run as administrator"). Then type the following two commands:
Code:
msiexec /unreg
msiexec /regserver
then reboot.

This fixes the problem about 90-95% of the time, even when it's a TEMP folder permissions issue. Until the next time it gets out of synch... which is virtually guaranteed when there's a feature update, like 25H2 in about three months...
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