Homebrew is the missing package manager for OSX. You can find installation instructions at www.brew.sh.
Open your terminal and enter:
brew tap paritytech/paritytech
Simply install parity:
brew install parity --latest
This will install the latest feature-rich beta release.
If you require to install stable version of Parity for any reason, just open your terminal and enter:
brew install parity --stable
The latest nightly develop releases are available via:
brew install parity --nightly
In order to update Parity to the latest stable version use:
brew upgrade parity
Additional binaries are available via:
brew install ethabi
brew install ethkey
brew install ethstore