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I am having installation problems too.
W10 64bit - install file: calibre-64bit-4.23.0.msi
Installation proceeds but rolls back and reports an unspecified error.
Previous install 4.22 OK. No changes to system or hardware (apart from some minor Windows updates)
Last edited by Savate; 09-04-2020 at 04:47 PM.
Reason: updated info
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