This error occurs when the plugin folder name is incorrect. FlyingPress requires the plugin folder name to be exactly:
flying-press
If the folder name is anything else (e.g., flyingpress, flying-press-1, or flyingpress-pro), license validation will fail and you will see the error: "This license is not valid for this product"
Solution
Connect to your site via FTP or File Manager.
Navigate to:
wp-content/plugins/Rename the plugin folder to:
flying-pressRefresh your WordPress admin and revalidate the license if needed.
Why This Happens
FlyingPress uses the folder name internally to verify the product identity. Changing the folder name breaks this check, resulting in a license mismatch.