It was designed for Windows XP, Vista, and 7. Running it on Windows 11 can cause system instability.
If you are looking for the "full version" today, keep a few things in mind: avg-pc-tuneup-2012-full-version
Legacy software no longer receives security patches. Always ensure you are downloading from a verified source to avoid "repacked" installers containing malware. It was designed for Windows XP, Vista, and 7