macOS 13 or later, Apple Silicon.
MDWatch is unsigned, so macOS quarantines the download and blocks the first
launch. After dragging it to Applications, run this once:
xattr -dr com.apple.quarantine /Applications/MDWatch.appsha256 38ec95d009bf3b57d21f448ff7d29895a839b8744d52237f2cbe5925ccde6d0e