Here’s how these users can disable automatic updates in OS X El Capitan.To disable automatic updates in El Capitan, launch System Preferences and select the App Store icon.
For one thing, running an old operating system means you won't receive critical security updates from Apple.
Moreover, many third parties have stopped releasing software updates compatible with older operating systems.
A possible exception to consider with this approach is to allow OS X to continue to install system data files and security updates, as these are typically very important and time-sensitive security patches which may leave your Mac vulnerable to online exploits if left uninstalled.
Dropbox Update is a process that makes sure the Dropbox desktop application is running the latest version.
Some early Intel Macs released in 2006 are stuck with Snow Leopard (10.6), which hasn't received security updates since the release of Mavericks three years ago.