HELP!

So I recently discovered that I could get sims on my iMac, instead of playing on my very laggy laptop that I have. Especially since I have add ons. I was downloading it, and I was confused why my add ons literally were not being added on. I searched it up, and it says it's because I bought a windows version of the add on. But I feel like just because I bought the add on with a window version, it should be in some sort of file that when you download from the same account, it will be there no matter what. If the add on is not yet available on iMac is one thing, and frankly kinda stupid but I'm assuming that they just added this compatibility with iMac recently so whatever. But what do I do? I have the Get famous pack, which is the only pack that I can download, I also have cats and dogs, vampires, and seasons pack. I don't want to re-buy them, so is there a way I can switch it or something? Or have EA switch it/add it on my account? I'm not sure how kind EA is with this sort of stuff. But I would like at least an answer/solution to my problem. Any help is needed! Thank you!