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NASPA Zyzzyva version 3.0.3 was a time-limited test edition of Zyzzyva that expired on May 1, 2015, replaced by version 3.0.4. It was released for Windows and OS X, but is no longer available.
For step-by-step installation instructions, see:
Please note that as of May 6 2015, Norton Antivirus has incorrectly flagged Zyzzyva as suspicious for Windows users. As such, Norton users must train the antivirus software to ignore the folder where Zyzzyva lives (which is either C:\Program Files\NASPA Zyzzyva 3.0.3 or C:\Program Files (x86)\NASPA Zyzzyva 3.0.3, on Windows). Here is a good summary of how you to do so: http://antivirus.about.com/od/securitytips/ht/excludefilesfromnorton.htm
Here is a procedure used by one user to correct the Norton issue:
First, restore the program:
Next, before exiting Norton, exclude further activity against this program:
Zyzzyva should now be restored, and should not be quarantined by Norton in the future.
You may need to restore the program icon from the desktop shortcut at this point. To do so, follow these steps: