vBulletin 3 is end of life and will not be receiving future development. Warning: vBulletin 3.8.11 is not compatible with PHP 7.2.0 or higher.
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Try uploading original vBulletin version non-image files in ASCII mode (except install.php and images folder) to overwrite those on server
List any files that do not belong or have not been overwritten from an upgrade. Admin Control Panel > Maintenance > Diagnostics > Suspect File Versions
[Note: In some cases you may also need to remove any of the listed .xml files in the includes/xml directory.]
Disable plugins from file includes/config.php and add this right under <?php on the next empty line or uninstall any modification(s) that have not been updated to work with new vBulletin stable release
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