trouble with old version

 Ok, so I just recently decided to revisit my original Sins game but its an old Impulse version, I believe from Gamestop if I remember right. Im having trouble signing in to update the game through them.  Im assuming Impulse no longer exists? 

 Is it just gonna be simpler for me to go grab a new Trinity Pack than trying to update/upgrade my old version? 

   Just felt like playing the original again a few times  Thanks for your time.