Installing Sims 4 with new account

I tried to sign in with my old account information to access the Sims 4, and origin didn't recognize my information/said it was expired. So I created a new account and tried to install my copy of the Sims 4 (which was installed on a different computer when I first got the game 4 years ago), but it won't let me install it because the code has already been used. How can I access or install my game?