When you use a nulled version, you cannot access official security patches from the vBulletin Members Area
Nulled scripts are rarely "free" out of the kindness of someone's heart. Most nulled distributions of vBulletin 3.8.7 contain hidden backdoors, malware, or obfuscated PHP code Malicious Scripts: vbulletin 387 patch level 3 nulled php top
A "Nulled" script is a paid software package that has been modified to bypass the developer's license verification. In the case of vBulletin, this means the software no longer "calls home" to verify that the owner has paid the $200+ licensing fee. When you use a nulled version, you cannot
While these versions were once popular in the "warez" community for building community sites without paying fees, they carry significant risks: When you use a nulled version
If you want, I can: