Hi Lance -
0.42 is the latest version of Edge Reflow (there will be a new one coming next week, but the one you have should work fine).
You need Photoshop CC 14.1 or newer, and you install this via the Creative Cloud desktop application.
If your Photoshop has the "Generate" submenu but not the Reflow item in that submenu, then you probably have an appropriate version of Photoshop, but are missing the Reflow Plug-in for Photoshop. It should be installed automatically when you install Reflow, *if* you already have Photoshop installed. You can get the Plug-in from a link on this page: Photoshop CC Workflow | Edge Reflow CC (Preview) | Edge Tools & Services | Adobe & HTML
(search for "If you need to re-install the plug-in" on that page, if you don't see it).
After installing the plug-in, it should work.
Vic