If you registered the game to your Origin account then go to origin log whit the account you registered the game on go to "my games " section in origin then press your Sims 3 game icon then press download when it is finished install it update it and you are all set to go if you have any problems or can not log whit that account then
For this you will need to contact Origin/EA support they will gladly help you whit this problem https://help.ea.com/en/origin go here press contact as give information press I still need help at the bottom of the page and then press start live chat and you will get a live chat whit an EA agent that will be glad to help you
if this helps pleas give XP to my account thanks
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