So sorry to you ALL for the late reply!
It worked for me, I suspect because I did get the ReShade files from my friend. She clarified for me that when she set up on her MBP she had Parallels installed and she was able to run the ReShad program and it created the file she was needing. She'd just gave me a copy of the same files and I'm guessing that's why it worked for me. My MBP does not have Parallels. She said she only had to use it for a moment and it generates the preset '.ini' file she needed.
As for the ReShades I'd picked I got them here:
She followed these steps to run it initially before her Parallels expired:
-- If you're running Catalina make sure to select the 64bit version
Download your preferred preset. Some examples are here:
Thanks for the update but it still doesn't make sense because of how Reshade works. Reshade must be installed as it works with the game, at least that's how I understand it. I found this that seems like a good explanation (source):
ReShade doesn't run in a process. It pretends to be the DirectX or OpenGL driver, so that games load ReShade instead of the actual driver and send all render commands to ReShade. ReShade then passes those commands on to the real driver while adding and modifying some commands to do its thing.
That's a couple of years old granted but wouldn't even work with the current version of the game which is for Metal compatible Macs only, you would have to be running the Legacy Edition of the game for OpenGL support.
I really want to be wrong, and I hope I am, because I would love to use this in my game. Could you maybe post step by step instructions and upload the preset you are using so I can test it in my game? If you'd rather do this privately please say so and I will temporarily open my inbox for DMs
Go to the Drive where your Sims 4 app is located > If you're using a trackpad use two fingers on the track pad click on the app one time. If you're using a mouse then right click the app > This opens the menu popup box > Select "Show Package Contents" > Open the "Contents" folder > Open "MacOS" folder > Paste your ReShade files here.
The files you should have inside of your macOS folder are in the screenshot below. The macOS folder must have d3d9.dll, ReShade.ini, and reside-shaders files. Then you pick your preset file the determines the settings of your lighting and place it here too. In my screenshot you can see I've chosen the preset, "Simemi's Preset V2".
The activation process of doing through F2 on a PC does not seem necessary in game, for me, as I never did it but noticed my game immediately looked different. When I start my MBP it's immediately got the look of the chosen preset.