If you found this file online, be cautious. Cracked or "repacked" versions of professional software in .rar format are common vectors for malware. Always ensure you are downloading software from official or verified sources.
: Many designers keep specific archives like this because newer versions of Creative Cloud sometimes drop support for older operating systems or change workflows that users prefer in the 2019 build. Illustrator 2019.rar
While it looks like a simple utility file, here is why it might be considered "interesting" or important to someone: If you found this file online, be cautious