Official streams use newer codecs (like H.265/HEVC or VP9) which offer better quality at lower bitrates than standard H.264 downloads, and they include the proper closed captions and 5.1 surround sound audio.
If you are attempting to download an H.264 file of this episode from an unofficial source, be aware that these files can often be mislabeled or contain malware. Always prioritize official streaming platforms to support the creators and ensure your digital safety. young sheldon s03e18 h264