DMG Canvas 3.0.2 was officially released on . System Requirements : It requires macOS 10.12 or later.
: Includes a command-line tool ( dmgcanvas ) that can be integrated into Xcode build processes for automated disk image creation. Version 3.0.2 Details DMG Canvas 3.0.2
While newer versions (such as 4.2.x) are available for macOS 11.0 and later, version 3.0.2 remains a documented legacy build for users on older operating systems. DMG Canvas - Disk Image Layout and Building for macOS DMG Canvas 3