for 4.2.4 or higher,4.2.5,4.2.6 ，it's works ， this is the way which makes Always in evaluation mode 。

1. go to the dir : /Applications/Beyond Compare.app/Contents/MacOS
2. change the name BCompare to BCompare.bak
3. touch a file name BCompare , and chmod a+u BCompare
4. insert BCompare the content :

#!/bin/bash
rm "/Users/$(whoami)/Library/Application Support/Beyond Compare/registry.dat"
"`dirname "$0"`"/BCompare.bak $@