I'm running Mojave 10.14 and Safari 12.0 and CCleaner for Mac 1.15.507 no longer clears the history in Safari. Your program no longer finds the same amount of files to clean as it did before I updated my OS and Safari. CCleaner still works fine for Chrome, FireFox, and Opera. I wonder just what CCleaner is "cleaning" in Safari 12.0?
Since the last update for CCleaner for Mac is long time ago ... I would also be glad to see a new update coming that supports the full features of the actual macOS.
(!)