Well the official installation guide states this:
Quote:
Also make sure your server is running on PHP 5.3.0+ and supports PDO, the latter is especially important.
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So PHP 5.2 is not supported by the script, and never will be. You need to find a way to upgrade to PHP 5.3, some webhosts provide ways to choose the PHP versions. Ask 000webhost if this is possible, and if not you may need to switch to other webhosts such as x10hosting.