As far as I know, none of the 0.7.x versions of Sigil is supported on OS X 10.7 (Lion). You need Mountain Lion (10.8) or newer to run Sigil v0.7.x.
From the InstallationInstructions on the wiki
Quote:
Mac
Supported on 10.8 (Mountain Lion). Should run on 10.7+ on Intel Macs with a x64 processor.
Unpack the DMG file and drag the "Sigil.app" file to your Applications folder.
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Bolding mine.