Before installation or updating vBulletin you must:

1) Check the release with validator.php to make sure, that it does not
   contain any changed files or just use our release without keygen.
2) CHMOD all files 0777 to  write the new data in them.
3) Execute keygen.php
4) Remove keygen.php from server after genering and enjoy.

WARNING: DON'T FORGET to return CHMOD back before start using your
forum. It's safety requirement!

 **** Validator ****

Upload all files in BINARY mode.
Run validator.php before editing files to verify release.
Use online verifier of validator.php file and you will see NFO file.
Remove both files from server after checking and enjoy.
Remember, we include validator.php and checksums.md5 in our releases.
If you don't see these files, don't trust.
Do not modify validator.php.

Online tool: v[dot]scriptz-team[dot]info

Please note: You should validate downloaded release before
using it via URL above.
There are so many leechers in the scene now who want to break
reputation of [x-MoBiLe] NULL TEAM and other groups
(you know guys, who you are)