XF 1.1 Upgrading Issue

I was just wondering how you upgrade if you have changed the name of the admin.php file. It seems whenever you attempt to login to complete the upgrade it continues to search for admin.php.
Thanks Brogan,
I renamed admin.php to help have better security - I have managed to edit the upgrade file to look for the newly named .php file (after logging in) and it worked (successful upgrade) but will look at the thread you posted. :)