The Sims 2 Ultimate Collection.

I own every pack in the Sims 2 on disk, was never able to add it to the app on origin.  Now I want to play.  I should not have to re-purchase it.   What is the procedure to inter my already existing code and play the game?  Those of us who already own it should be able to enter our code and play the game.   (Can't find my Sims 1 stuff so I'm willing to pay for Sims 1 only.)