You need to upgrade your PHP Version to PHP 5.3.1
You need to upgrade your PHP Version to PHP 5.3.1 we can not upload recent joomla sites because the host needs to use PHP 5.3.1 or higher to run this version of Joomla!
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Daniel Mersha
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Since Plesk 12.0 you can install any PHP versions (Plesk components). You can find this information in http://download1.parallels.com/Plesk/Doc/en-US/online/plesk-administrator-guide/index.htm?fileName=75153.htm
— SU