MEGA 4 is provided FREE for use in research and education (see terms below).

To download MEGA 4, please fill in the following information. This will enable us to provide information about future upgrades and software bugs to you. Also, it will allow us to assess the impact of this software.

Important Notice: By downloading MEGA 4, you are agreeing not to redistribute the MEGA 4 software and associated materials partially or fully in any form.

Many Mac users have reported errors while using MEGA with the CrossOver Windows emulator. If you wish to use MEGA for the Mac, please try our Beta MacOSX version released 6/24/2010. If you wish to use MEGA4 on Mac, we recommend that you use Virtual PC or Parallels Desktop for Mac.

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Autoinstall from Web
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Autoinstall from web
Download zip file only (use this option if you are experiencing difficulty with the autoinstall version)

System Requirements

MEGA 4 is developed for use on Microsoft Windows® operating systems: Windows 95/98, NT, 2000, XP and later, and Vista. MEGA 4 can also be used on Linux-based systems using WINE. We recommend a computer with at least 64 MB of RAM, 50 MB hard disk space, and an entry-level Pentium processor or equivalent. For analysis of large datasets, you should have a faster processor and larger amount of physical memory for efficient computation.

MEGA 4 can also be run on unsupported operating systems for which Windows emulators are available.

To obtain MEGA 4 by mail, contact:
Sudhir Kumar
Center for Evolutionary Functional Genomics
The Biodesign Institute
PO Box 875001
Tempe, AZ 85287-5301 USA
NOTE: Please put "MEGAreq" as the subject of your e-mail so we can filter out our real software requests.

Fax: 480 727 6947
Although utmost care has been taken to ensure the correctness of the software, the software is provided "as is" without any warranty of any kind. In no event shall the authors and their employers be liable for any damages, including but not limited to special, consequential, or other damages. Authors specifically disclaim all other warranties, expressed or implied, including but not limited to the determination of suitability of this product for a specific purpose, use, or application.