To fix this, simply add the line below to the bottom of the .htaccess file in your store's main folder and then reupload it:
SetEnv DEFAULT_PHP_VERSION 5
Heart Internet run PHP 4 by default, however Interspire Shopping Cart requires PHP 5.0 or above. Adding this line to your .htaccess file tells your web server to use PHP for your web site instead of PHP 4 and everything else will run as you'd expect it to. Simply press F5 in your browser to refresh the installation wizard and the error message should be gone.

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