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Extras for Cognitive Productivity with macOS Book Are Now Available as a Separate Package from Its Leanpub Web Page
Update 2019-05-16 The original post below is no longer valid. I have removed the "extras" only package of Cognitive Productivity with macOS from Leanpub. Rationale: Leanpub has clarified that all packages must include books. If you purchased the $5.00 "extras only" package, then you will still have