Yes, sharing the books is both acceptable and encouraged! The full copyright info is here. Essentially, you’re not allowed to sell the book or borrow/steal the plot for other things, but you can give away copies of what we’ve produced for free as long as you keep all the copyright notices etc in the book.
You can even remix them using the Scrivener project file if you like, to create a version with your preferred chapter blend. Alternative covers (one with a grey ‘sticker’ and one with no sticker) are included in the Scrivener project file if you’re so inclined!