Quote:
Originally Posted by theducks
Since you use Calibre 
Install the plugin found in this message (frequentl revised in same message)
https://www.mobileread.com/forums/sho...8&postcount=33
Once the Installation instructions have bee completed exactly 
select the book.
Press Alt-E
Presto. book (EPUB) opens in Sigil
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Just a slight correction to the above - while the "Open ePub in Editor" plugin link that theducks pointed you to above does indeed allow you to add a context menu to right-click and open the EPUB in Sigil, it does not have keyboard shortcut capabilities. These were added in the more generic "Open with" plugin located later in the same thread at:
https://www.mobileread.com/forums/sho...&postcount=119
It is mentioned in red within the post theducks pointed you at but thought it worth repeating here in case your eyes glazed over it

. The "Open With" plugin I linked to does everything the other does and a lot more, such as the ability to assign keyboard shortcuts like the default of Alt+E it comes with for Sigil.