Hasn't the 64 bit metal version of the sims 3 been yet?

@emilyofspielburg - In case you are still looking for this, the 64-bit version requires High Sierra or higher for an operating system and a Mac that supports the Metal API. I'm afraid that a 2008 Macbook Pro is not going to be able to run this version. The first MacBook Pros that were Metal capable were released to market in 2012.

https://answers.ea.com/t5/Technical-Issues-Mac/A-partial-guide-to-64-bit-Sims-3-for-macOS-in-progress/m-p/9656868#M11443