1st step
Install Virtual DJ

2nd step
open the installation path where you have installed VDJ 
defauld path = C:\Program Files\VirtualDJ\

!!!!!!!!!IF YOU WANT SKINS SAMPLES ETC...!!!!!!!!!!!!

!3th step                                                                                                                               !
!open your Documents                                                                                                                    !
!                                                                                                                                       !
!4th step                                                                                                                               !
!Replace the old "Virtual DJ" folder with the new one which is on "Virtual DJ Skins,samples and Sound Effects" folder (in download pack)!