Hello,
A 403 Forbidden error in the WoodMart Image Optimizer usually indicates a server-level permission issue, security plugin block (like ModSecurity). Contact your hosting provider and ask them to check the server logs for 403 errors, specifically looking for ModSecurity blocking requests.
Otherwise, please share your Site WP-ADMIN Login details in the Private Content field so that we can check this concern on your Site and help you out accordingly.
Best Regards