Unless you are specifically looking to test and report back on failures, you should not be using Sigil-0.9.991 as there has already been reported a large number of bugs (and fixes for them are in master). You should probably stick with the normal (non-alpha) build.
Yes it means your .epub file is not a .epub file (ie. a zip container) and is instead a folder. You probably have your machine set up to unzip zip archives on download. This is probably not the best idea.
Last edited by KevinH; 12-05-2019 at 01:21 PM.
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