www.server.com/forum/index.php?ipscheck=1&key=ipscheck$1@@

Between the <version_string></version_string> tags.

www.server.com/forum/docs/CHANGELOG.html

Left, add 1 to the latest 'Changes since' version.
_______________________

eg:

1. Changelog

   i. Changes since 2.0.19

Would mean the phpbb version would be 2.0.20

View the index.php HTML source ( view > page source )
and a few lines down you should see:
<meta name="generator" content="vBulletin x.x.x" />
x.x.x = version number

www.server.com/forum/clientscript/vbulletin_global.js

3rd line down, just above the copyright notice