npm install electron-nightly@v4.0.0-nightly.20180821

yarn add electron-nightly@v4.0.0-nightly.20180821

Note: This is a nightly release, this means it is shipping with the latest "main" branch Electron code.
It uses an unstable version of Chromium and may be more unstable than our beta releases.
Please file new issues for any bugs you find in it.