Hmm, which exact version of macOs are you using? If I double-clicked an epub in old Sigil-0.9.9, I would get an empty epub instead of the one I double clicked or sometimes two windows, one empty and one with the epub. If I used open with at the macOS level with Sigil closed, all I got would be an empty epub.
This now all works with Sigil.
If Sigil is already open, use the menus to open a new epub or drag and drop the epub on the Sigil icon in the dock.
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