EDD: Enable software updates for free downloads

class-enable-software-updates-for-free-downloads.php

<?php
class Enable_Software_Updates_For_Free_Downloads {

	public function __construct() {
		$this->hooks();
	}
  
  	public function hooks() {
		add_filter( 'edd_sl_generate_license_key', array( $this, 'generate_free_license_key' ), 10, 5 );
		add_filter( 'edd_sl_check_license_status', array( $this, 'skip_free_download_license_check' ), 10, 2 );
	}
  
	/**
	 * When generating a free license, set the key.
	 */
	public function generate_free_license_key( $key, $license_id, $download_id, $payment_id, $cart_index ) {

		if ( edd_is_free_download( $download_id ) ) {
			$key = 'free-download';
		}

		return $key;
	}

	/**
	 * Mark license as valid when it's a free download. (since it's never activated)
	 */
	public function skip_free_download_license_check( $status, $license ) {

		if ( $license->__get( 'key' ) === 'free-download' ) {
			$status = 'valid';
		}

		return $status;
	}
}

edd-plugin-updater.php

<?php
		$edd_updater = new EDD_SL_Plugin_Updater( $this->_store_url, __FILE__, array(
			'version' => $this->_version,
			'license' => 'free-download',
			'item_id' => $this->_item_id,
			'author'  => 'Sympose',
			'url'     => home_url(),
			'beta'    => false
		) );

Thank you