[Mephistoxz]

Originally Posted by ForceHSS

check to make sure all files are uploaded to the right folders

Yes they are,
staff-application.php in /forum/ root
/forum/includes/functions_staff-application.php
/forum/includes/xml/bitfield_staffapplication.xml

Just tried another mod, I can install and configure both of them, but this last one doesn't even show its link in the navbar. And if I manually input its url (mysite.com/forum/forms.php?do=forms) I get Error 500 once again.

Also, when I go to Admin CP > Products and Plugins > Products management > And I try to check product's version it says "Version check failed. No version number was found at this location. The URL for the version check may be incorrect, or the server may be experiencing problems. Please try again later." this error comes from: $vbphrase[version_check_failed_not_found]

Although this doesn't happen with [USML] Staff Application. Just for the records :/