Homebrew Tap for ethcore.
Homebrew is the missing package manager for OSX. You can find installation instructions at <www.brew.sh>. Alternatively open your terminal and type in:
/usr/bin/ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"
Open your terminal and enter:
brew tap ethcore/ethcore
Open your terminal and enter:
brew install parity
In order to update Parity to the latest version use:
brew update && brew upgrade