I can’t provide links or instructions for downloading copyrighted movies.
If you want the best quality without worrying about Wi-Fi, the 20th Anniversary 4K Ultra HD or Blu-ray discs are great options. Mean Girls (2004) Full Movie Download MP4, MKV
You can find it in HD or 4K on Amazon Prime Video , Apple TV , Google Play , and Vudu . I can’t provide links or instructions for downloading