OnyX is compatible on versions of OS X 10.2 and later, but you need the right version of OnyX on your Mac, otherwise it won’t work: Download OnyX 2.9.6 for Mac OS X 10.10 Yosemite Download OnyX 2.8.8 for Mac OS X 10.9 Mavericks.

> OnyX OnyX is a multifunction utility that you can use to verify the structure of the system files, to run miscellaneous maintenance and cleaning tasks, to configure parameters in the Finder, Dock, Safari, and some of Apple's applications, to delete caches, to remove certain problematic folders and files, to rebuild various databases and indexes, and more. WARNING: There is a specific version of OnyX for each major version of the operating system. Use the specific version, and don't try to use a non-compatible version. Word spell check using australian english word for mac 15.33.