In this tutorial I will teach you how to null the WP Smush Free version to convert it in Pro version.
You have to follow very simple steps as follows:
1. Go to WP Repository and search for WP Smush
2. Install WP Smush to Your WP Site
3. Go to WP Smush plugin installation folder
4. Go to “lib” folder
5. Open file “class-wp-smush.php” for editing
6. Search for “if ( empty( $api_key ) )”
7. This function returns false, so change to true.
Voila! You have the pro version now.