Help with legit and cracked!!

Could I install the cracked expansions and sps with the legit base game and legit gtw?

Hello, and welcome to the forum, 
it would be possible, but you couldn't access Gallery anymore, as cracked addons get rid of it to work properly. Also Origin could update game and crack would be broken, so you'd need to download whole game pirated. Many things could go wrong if you don't know well with computer and secret stuff that developers don't talk about. But if you know go ahead and let us know if you need any help.

I suggest you to download all pirated addons from here, and keep you legit Base Game as you can download stuff grom Gallery and then out it into your pirated game. 

Take a look at this thread.