yWriter5 BETA, yWriter6 and yWriter7 are all identical in operation. They're just compiled for different versions of Windows. (yWriter5 and yWriter6 don't work as well with unicode character sets.)
** Mobile versions of yWriter are designed for editing your PC projects on the go, using Dropbox.
The original Windows 98/XP version (yWriter2) installer is here just in case you have a YWP project from 20+ years ago.
(Use yWriter2 to convert from YWP to YW2, and then you can import the YW2 into yWriter 5 or later)
You can still get yWriter3 here here if you really need it.
I'm Simon Haynes, programmer and author.
Welcome to Spacejock Software
All my software is virus-free. No unwanted toolbars, trojans or other nasties.