Older versions of vBulletin.
 

As an administrator over several sites looking to open a site of my own I have decided I am most fond of vBulletin 3.8.x. If I were to purchase vBulletin 4.0 Forum Classic would I be able to use vBulletin 3.8.x instead?

Thank you for your help in advance! Have a nice evening/day/afternoon!