@Sthenastia - Aha! And apologies for any misunderstanding. Fellow TS3 Steam player here as well, but the discount I got on all EP/SPs years ago was only around or just under 75% off so you got a much better deal. Congrats on that and where's my extra discount money? I want it now (not really). :)
Here's a good place to begin. To be fair, we at NRaas had some input and made suggestions for this list, but it's very EA and player friendly.
https://answers.ea.com/t5/Technical-Issues-PC/Sims-3-Common-Game-Fixing-Mods-Hero-Approved/td-p/9836847
