The future is dark... Depending on your preferences.
Scrivener 3 is now available on the Mac App Store, and we have a Scrivener 3 migration guide available for users of Scrivener 2.
Scrivener 2 has been removed from the Mac App Store to make way for Scrivener 3...
Scrivener 3 brings with it much better support for creating Epub and Kindle files.