'electron-packager' is not recognized as an internal or external command

Question

I recently started using electron. I have successfully completed the 1st phase by creating a hello world app (included files index.html, main.js, package.json). Now I am trying

Answer 1

In my case it doesn't worked after npm global installation.

On the electron-builder Readme page it's recommended to install with yarn.

Yarn is strongly recommended instead of npm.
yarn add electron-builder --dev

Also we can put folder directly to PATH. On Windows 10:

1. Search with word "environment" and open Edit the environment variables.
2. Select, edit and Add new value C:\Users\USER_NAME\AppData\Roaming\npm to variable Path. Replace USER_NAME with your Windows username.

Then we might need to restart or logout.

Also in my case I enabled script execution on Windows 10 with instruction on answer below:

PowerShell says "execution of scripts is disabled on this system."