Current versions of WinRATS (and all versions from 7.2 on) run properly on all recent versions of Windows, including Windows 11, 10, 8, 7, Vista, and XP, as well as Server 2003 through 2025.
MacRATS requires requires version 10.14 (Mojave) or later of OS X. It has been tested with all OS X upgrades through Sequoia (15).