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Old 06-10-2020, 02:52 AM   #4
kovidgoyal
creator of calibre
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Posts: 45,435
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Join Date: Oct 2006
Location: Mumbai, India
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I dont think really old signatures are kept around forever. You can always download and install it manually, https://download.calibre-ebook.com/3.7.0/

instructions are on the download page.
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