Check out the releases (darwin is OSX)

To run the app in development mode, enter the directory and:

npm install && npm start

Setup your environment:

• Install electron-packager globally (npm install -g electron-packager)
• (If on Linux or OSX) Install wine (brew install wine)
• Run "npm install"

The dist-win32.sh script will build a release in ~/QMK Firmware Flasher.

Use npm run pack on OS X to make a DMG that can be distributed.