lost my download and can't re redeem product code

Isn't it showing in the 'My games' tab in Origin?

I also have the same problem, the game isn't in the my games part of Origin, the product codes can not be used anymore, the Sims 4 can ot longer be loaded, if you know how to help without re buying it, then please do

If the game is no longer shows up on your Origin client, please try the following things

• Restart Origin
• Log out and back in and use the email address instead of the username. Make sure to use the one you used to register the game in the first place
• Make sure it's not under Hidden Games
• Reinstall Origin
• Restart your router/modem,
• Get in touch with a game advisor.

Game advisors can be found through live chat or call-back

1. https://help.ea.com/en/contact-us/ 
2. Click on the orange NEXT button
3. Select a platform
4. Click on the orange NEXT button
5. Select a topic and describe your problem in a few words
6. Click on the orange NEXT button
7. Click Chat Now to chat with a Game Advisor or leave your phone number for a call-back
   

In Details here: How to contact a Game Advisor using the new EA Help page