Downloading as a .rar file usually refers to downloading game mods rather than the game itself. Official versions of the game are distributed through verified platforms like Steam or GOG and do not come in .rar format.
If you are looking to download and install mod files (which often use .rar or .zip compression), follow this report on how to handle them safely and correctly.
: The primary hub for Stardew Valley mods. Use the Nexus Mods Stardew Valley page .
Always use reputable community sites to avoid malware or broken files:
: A free, open-source tool available on the 7-Zip Official Site .
: A popular alternative that offers a free trial, found at the WinRAR Download Page . 2. Where to Safely Download Files