Hello
Your sims 4 game is linked to your origin account. When you own a Mac version, you can download the game on Windows but you need to download the windows version through Origin . Download /install the Windows version of Origin onto the other computer. Then log into origin on this other computer using the same account that you used to register the game and packs on the Mac , then click on the Games Library section, click on the sims 4 picture, then download/install it there. Then click the extra content and packs buttons that are half way down the page. They will shows you what game packs, stuff packs and eps you own. You can then download/install them there.
Make a copy of your sims 4 folder that is on your Mac computer that is in Documents > Electronic Arts > ( then The Sims 4 folder is there ) and place it on an external drive.
Then after installing the sims 4 game onto the other computer, play it once to generate a new sims 4 folder.
In your sims 4 folder are your saves folder ( contains your save games) and the tray folder ( which contains your lots and households that you have uploaded to your library or have downloaded from the community gallery ) Replace the saves, tray, mods, custom music and screenshots folders that are in the new sims 4 folder with the same folders that are in the sims 4 folder on your external drive. You will then have your old save games, mods and creations etc on your other computer :)
