According to WPMU DEV community forums , users of the official plugin sometimes encounter the following:
Automatically scales large images to fit the exact dimensions of their container on your site. Common Issues & Troubleshooting smushpro-3122.rar
Downloading .rar files containing premium plugins from third-party or unofficial sources is not recommended . These files are frequently injected with malware, backdoors, or malicious scripts that can compromise your website and server security. What is Smush Pro? According to WPMU DEV community forums , users
Unlimited image optimization with one click, removing the 5MB file size limit found in the free version. What is Smush Pro
For a safe and fully supported experience, it is highly recommended to use the official Smush free version from the WordPress repository or purchase a subscription directly from WPMU DEV. [Smush Pro] WP SMUSH CDN NOT WORKING - WPMU DEV
The file smushpro-3122.rar appears to be an unauthorized or "nulled" distribution of , a premium WordPress image optimization plugin developed by WPMU DEV .