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For reference, how to install the module through composer:

1. Add sachinchoolur/lightgallery as a repository in your composer.json
Should be added to the list of repositories like this:

"repositories": [
        {
            "type": "composer",
            "url": "https://packages.drupal.org/8"
        },
        {
            "type": "package",
            "package": {
                "name": "sachinchoolur/lightgallery",
                "type": "drupal-library",
                "version": "1.2.21",
                "dist": {
                    "url": "https://github.com/sachinchoolur/lightGallery/archive/1.2.21.zip",
                    "type": "zip"
                }
            }
        }
    ],

2 Get the library

composer require sachinchoolur/lightgallery

3. Get the Drupal module

composer require drupal/lightgallery