upgrade error.

[JMEWLS`]

Fatal error: Out of memory (allocated 71041024) (tried to allocate 3921 bytes) in [edited security]/ includes/class_diff.php on line 146

whats up? I get that message.

[Lynne]

You need to increase your memory_limit in php.ini or in your config.php file:
ini_set('memory_limit', xx );
Change xx to whatever you need.

If you have further questions regarding installing/upgrading vb4, please post on vbulletin.com. See this sticky - Installation Issues / Questions or bug reports regarding default vBulletin 4.0 (https://vborg.vbsupport.ru/showthread.php?t=228035)