To understand why you cannot download Smadav on a Mac, you have to understand the nature of the threats Smadav is built to fight.
To be absolutely clear, the official Smadav website (smadav.net) only provides download links for Windows versions (XP, Vista, 7, 8, 10, 11). There is no mention of macOS, iOS, Linux, or Android versions. The developer has focused solely on the Windows ecosystem, specifically targeting USB flash drive viruses and Autorun infections—threats that are virtually non-existent on macOS. Download Smadav For Mac