Re-elect/gat out of hell bundle

I just bought the saints row 4 re-elect/gat out of hell ps4 bundle and found out that gat out of hell is a dlc, my game didn't come with the dlc slip.
My question is how do I get ahold of that dlc slip?
 
As for as the game when it came out on xbox 360, I hated the game because it kept glitching and freezing up, my son loved the game but now that I got it on my ps4 pro and is actually able to play it, I like the game a lot and playing in at 46% completion I only had 3 glitches but the last glitch when I started the game back up it gave me that area that I was in the middle of taking over
 
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