# Installing LyX/Mac 1.3.5

The prerequisites for LyX/Mac are Mac OS X, version 10.2 or later and teTEX. If teTEX is not installed on the system, LyX will not be able to format, preview, or print documents.

NOTE: By default, the installer will place the new LyX application in your system-wide Applications folder, overwriting any old version you may have there. If you wish to keep your old version, move it or rename it before continuing.

For information on configuring and using LyX/Mac, including installing teTEX, go to http://wiki.lyx.org/pmwiki.php/LyX/Mac.