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your practice of checking SHA1 or MD5 differs from mine, because, I don't.
I use Firefox on W7 (an XP), I download from the main Caibre site. I have had 2 (TWO) corrupted downloads in 5 (five) years of almost weekly updates.
If you had tried to run the 36 installer a second time, you would have seen the 'Change' Calibre box instead of the 'Install' Calibre box
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