Hi all,
I am running a RH9 server with zend optimizer v2.5.1 and would like to downgrade to v2.1.0 due to compatibility issues. How do I go about doing this? Thanks

Check out the how-to I wrote for this posted here. Enjoy http://www.webhostingtalk.com/showthread.php?s=&threadid=247372

you just need to overwrite your php.ini or edit your current php.ini and remove zend then reinstall any older version you wish