Do not attempt to mount Smaart 6.1.0 OS X.dmg on an Apple Silicon (M1/M2/M3) Mac. The installer will fail because the PPC/Intel 32-bit code cannot be translated.
While the technical need for Smaart 6.1.0 is understandable, obtaining the file presents significant risks. Because Rational Acoustics has long since moved on to Smaart v8, official download links for version 6 are rarely available on their public servers. This forces users to look toward third-party "abandonware" sites, forums, or file-sharing repositories. Smaart 6.1.0 OS X.dmg