Gaaaaaaa####! The comments above seem straight forward, but there's a catch. I upgraded (from 0.8.7) to Sigil 0.9.8 from GitHub and the notes say that now the epub2 validator FlightCrew is a plugin and the latest version (0.9.1) should also be downloaded and installed.
I'm on MacOS 10.13.6 so on GitHub I chose the download FlightCrew_v0.9.1osx.zip The problem is that the plugin file in the osx folder is a Unix executable file, not a zip file, so of course it's grayed out when I try to add the plugin.
Will someone please tell me how to get the horse hooked up to the buggy. Don't mean to seem so dense, but I'm a nearly 80yo author that's trying to complete a book. Thank you kind souls in advance :-)
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