If your Apache web server runs suEXEC (HostGator does), then you don't need to make your Dolphin installation vulnerable with all the 777 and 666 permissions that the installation script forces on you.
In that environment, Dolphin works with standard 755 and 644 permissions.
Here's a simple hack to bypass the permissions checks in the installation script.
Edit /install/index.php.
Look for the lines:
function isFullAccessible($filename)
{
And below it insert:
return(true);
Then look for the lines:
function isRWAccessible($filename)
{
And below it insert:
return(true);
That should do the trick so that the installation script does not force you to change the permissions before it will continue.