Upgrade Script Issues
 

For some strange reason, when I try to access the Upgrade Script for my forum, it redirects me to the main page of the website!

I uploaded everything properly, the config.php file is fine, and the install.php file has been deleted. I have no idea what's wrong.

I am currently using a WordPress + vBulletin Integration plugin called vBridge, which shares the two databases so that they would use the exact same login. Even when I disabled the vBridge plugin, I face the exact same problem.

Also, it seems I am getting this message: The server encountered an unexpected condition which prevented it from fulfilling the request. - The script had an error or it did not produce any output. If there was an error, you should be able to see it in the error log.

Any help? I'm currently upgrading from 3.7.4 to 3.8.3