Rosetta and macOS 28

Superposer's Windows runtime runs through Rosetta 2. Apple has said macOS 27 is the last release with Rosetta for all apps; from macOS 28 (expected in fall 2027) it covers only certain older games. Today's runtime may stop working on macOS 28 until it's been tested there; we'll say so before you'd need to upgrade.

If you upgraded to macOS 27 from an earlier version, Rosetta isn't reinstalled automatically; Setup shows it as missing and helps you install it.