The best way to obtain AUCTeX is by using the Emacs package manager integrated in Emacs 24 and greater (GNU ELPA). Simply do M-x list-packages RET, mark the auctex package for installation with i, and hit x to execute the installation procedure. That's all.

This installation procedure has several advantages. Besides being platform and OS independent, you will receive intermediate releases between major AUCTeX releases conveniently.

If you cannot use ELPA, below you can find other download formats. Please select your system type: