This URL is a direct download mirror. Most major Iranian download portals use a "subdomain" system to manage their massive libraries. While the main website provides descriptions and instructions, the "s12" prefix indicates the specific physical or virtual server where the file is stored. Iranian data centers. Content Type: Compressed (.rar or .zip) archives.
Use the Scilit database or similar verification tools to check for known software signatures if you are downloading engineering or technical tools. s12 bitdownload ir
> handshake S12.ir --force --legacy