Based on available technical data, is not a widely recognized software product, game, or official media release; rather, it is a compressed archive file (using the .7z format) likely containing a collection of cat-themed images or memes.
If you haven't opened the file yet, (like Windows Defender or Malwarebytes) before extracting the contents. If this was found on a specific forum or site, checking the comments or "leech" logs on that platform is the best way to see what others thought of that specific collection. Caturday.7z
Be extremely cautious when downloading and opening .7z files from unknown sources. Compressed archives are a common vector for malware, Trojans, or scripts that can execute when the file is unpacked. Based on available technical data, is not a