Recommended instead for Mac OS/X users:
Buy Scrivener 3 for macOS (Regular Licence)
These downloads contain yWriter6 version 18.104.22.168, dated 30/Oct/2017
Download yWriter6 installer (2.1mb) (self-installing exe file)
Download the zipped version: yWriter6 zip file (1.7mb)
Getting started: After installing yWriter, create a new project, add one or more chapters, select the first chapter, add one or more scenes. Then double-click the first scene in the list and away you go.