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BetterRed, I did run the installer by simply double-clicking the .msi file. No reason to do it from the shell on Windows really. I don't see how my post would imply command line usage, but there.
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kovidgoyal, neither one of those scenarios apply to me. I haven't ever touched the source code, and if I've had a 32bit version, it was ages ago - and I've been able to just update the 64bit I now have at least several times in the past year.
I also just downloaded version 2.12.0 (
calibre-64bit-2.12.0.msi) and ran into the same error - here is
a screenshot of the error window itself, for reference. It happens as soon as the installer reaches the "Removing applications" status. Hitting cancel brings up another window, informing me that "The older version of calibre 64bit cannot be removed." Still, even after canceling that process and confirming that the older version cannot be removed, my calibre displays 2.12 (64bit) as its version number to the left of the bottom bar of the application.