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 Apple applications, to delete caches, to remove certain problematic folders and files, to rebuild various databases and indexes, and more.
OnyX is a reliable application which provides a clean interface to many tasks that would otherwise require complex commands to be typed using a command-line interface.
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.
OnyX 3.9.5 for macOS Big Sur 11
If you install a software update and the system fails to boot afterwards, this is what needs to be done. 10.14.6 can be updated normally via Software Update if using an APFS volume, and will need to be patched using an installer volume created with Mojave Patcher version 1.3.2 or later after installing. When Software Update informs you that your Mac is up to date, the installed version of macOS and all of its apps are also up to date. That includes Safari, Music, Photos, Books, Messages, Mail, Calendar and FaceTime.
Requirements: Intel-based Mac or Apple M1-based Mac using macOS Big Sur 11.1 or later.
OnyX 3.8.7 for macOS Catalina 10.15
Requirements: Intel-based Mac using macOS Catalina 10.15.
OnyX 3.6.8 for macOS Mojave 10.14
Requirements: Intel-based Mac using macOS Mojave 10.14.
OnyX 3.4.9 for macOS High Sierra 10.13
Requirements: Intel-based Mac using macOS High Sierra 10.13.
OnyX 3.3.1 for macOS Sierra 10.12
Requirements: Intel-based Mac using macOS Sierra 10.12.
OnyX 3.1.9 for OS X El Capitan 10.11
Requirements: Intel-based Mac using OS X El Capitan 10.11.
OnyX 3.0.2 for OS X Yosemite 10.10
Update Macos Mojave To Catalina
Requirements: Intel-based Mac using OS X Yosemite 10.10.
OnyX 2.8.9 for OS X Mavericks 10.9
Requirements: Intel-based Mac using OS X Mavericks 10.9.
OnyX 2.7.4 for OS X Mountain Lion 10.8
Requirements: Intel-based Mac using OS X Mountain Lion 10.8.
OnyX 2.4.8 for OS X Lion 10.7
Requirements: Intel-based Mac using OS X Lion 10.7.
OnyX 2.4.0 for Mac OS X Snow Leopard 10.6
Requirements: Intel-based Mac using Mac OS X Snow Leopard 10.6.
OnyX 2.0.6 for Mac OS X Leopard 10.5
Requirements: PowerPC-based Mac or Intel-based Mac using Mac OS X Leopard 10.5. OnyX only runs from an administrator account.
OnyX 1.8.6 for Mac OS X Tiger 10.4
Requirements: PowerPC-based Mac or Intel-based Mac using Mac OS X Tiger 10.4. OnyX only runs from an administrator account.
OnyX 1.5.3 for Mac OS X Panther 10.3
Requirements: PowerPC-based Mac using Mac OS X Panther 10.3 with BSD subsystem. OnyX only runs from an administrator account.
Mac Software Update Mojave
OnyX 1.3.1 for Mac OS X Jaguar 10.2
Mac Os Mojave Upgrade From El Capitan
Requirements: PowerPC-based Mac using Mac OS X Jaguar 10.2 with BSD subsystem. OnyX only runs from an administrator account.