Similarly, it's not impossible to have nitelights on custom buildings on a Mac, but since the Mac version lacks the two official SC4 patches, you have to use a particular GID for it to work. That said, I looked at the Day and Nite mod, I believe I have fixed the Float32 error that was causing it to CTD, I'll update the version on the STEX :edit: Done, re-download if you need the fix. I personally feel that the Mac version is just too much effort for serious modded play, hence I keep it just for testing/light mac-related modding personally. You'd need to have Steam installed under whatever 'Windows' system you intended to make use of, to do so.

I don't think Steam will allow you to download a Windows game from the Mac Client.

Otherwise you could go down the path of using a Virtualised OS, using something like Parallels, if going this route you need something that supports DirectX/Virtualised GPUs though. Your best bet would be to make use of BootCamp to create a Windows Partition for playing SC4. Are you using Catalina or Big Sur? If so then WineSkin no longer functions under Catalina or later due to it's 64-bit requirement.

How to install mods sims 4 wineskin