This is an interesting query because in the way you might expect.

Modern emulators (like newer standalone DuckStation, PCSX2, or RPCS3) require CHDv5 headers. Old chdman (pre-2018-ish) creates CHDv4 or older, which will fail to load or cause crashes. As of today (April 18, 2026), the latest stable MAME is MAME 0.278 .

Here’s the breakdown of why this is a unique piece of tooling and how to actually find the "latest" one. chdman (Compact Hunt Disk MANager) is not a standalone program you download separately. It is a command-line tool bundled inside MAME (Multiple Arcade Machine Emulator).