linux下ZendStudioServer的安装问题

ZendOptimizer算是安上了，但是ZendStudioServer安装的时候总是安装不上,现在把我的php.ini发来大家看看，有问题吗

CentOs php4.3.9 zendoptimzer2.6.2 zendstudioserver2.5.1

[Zend]
zend_extension_manager.optimizer=/usr/local/Zend/lib/Optimizer-2_6_2
zend_extension_manager.optimizer_ts=/usr/local/Zend/lib/Optimizer_TS-2_6_2
zend_optimizer.version=2.6.2
studio.install_dir=/usr/local/Zend
zend_debugger.expose_remotely=allowed_hosts
zend_debugger.httpd_uid=48
zend_gui_password=8b55548cbf6cefc10226bc3370b4fb8d
zend_gui.ini_modifier=/usr/local/Zend/sbin/ini_modifier
zend_debugger.allow_hosts=127.0.0.1/32
zend_debugger.allow_tunnel=127.0.0.1/32
zend_debugger.deny_hosts=
zend_extension_manager.debug_server=/usr/local/Zend/lib/Debugger-5.1.0
zend_extension_manager.debug_server_ts=/usr/local/Zend/lib/Debugger_TS-5.1.0
zend_ini_file=/usr/local/Zend/etc/zend.ini
;zend_extension=/usr/local/Zend/lib/Debugger-5.1.0/php-4.3.x/ZendDebugger.so
zend_extension=/usr/local/Zend/lib/Optimizer-2_6_2/php-4.3.x/ZendOptimizer.so

zend_extension=/usr/local/Zend/lib/ZendExtensionManager.so
zend_extension_ts=/usr/local/Zend/lib/ZendExtensionManager_TS.so