http://www.coffeecup.com/help/articles/how-to-make-shopping-cart-creator-work-with-php-5x/
The only drawback is you will have to modify the "config.inc.php" every time you upload changes to your shop.
An alternative is to log into your HostGator cPanel and change to an older version of PHP from there. Then you will not have to edit the "config.inc.php" file on every upload.