Nothing. You just need to download the game and use Winrar or some other program similar to extract it to your desktop. You cannot add the icon to your desktop and play, therefore you must go to the file and double click ZEQ2 whenever you want to play. A faster way is to add the file to your desktop.
download ssj4 pack
you have to download the add-on (sorry i dont know where), open it, then close it, then launch ZEQ2, pick Goku (obviously),, then power up to at least 10,000, then press f and w. You will transform into super saiyan lvl 1.
Just press f+s and the character will be visible
You really can't. ZEQ2 Heroes Of Earth includes bots.So you can download it at ModDB.com or at IndieDB.com .