Composer

A quote from composer website that describes the tool (https://getcomposer.org):

"Composer is a tool for dependency management in PHP. It allows you to declare the libraries your project depends on and it will manage (install/update) them for you."

Installation

Windows

Use the installer: https://getcomposer.org/doc/00-intro.md#using-the-installer

Or the manual installation: https://getcomposer.org/doc/00-intro.md#manual-installation

Mac or Linux (including wsl)

1. Run the commands as described here: https://getcomposer.org/download/ (the commands changed from time to time based on the composer version).

2. Move the bin that was created to usr/bin directory to allow use composer globally: mv ./composer.phar /usr/bin/composer (maybe require sudo permission).

3. Run: composer -v and make sure it returns the expected version, if not restart your shell client.

4. cd into Elementor root directory and run composer install