A question about the account at EA Games

EA app holds all the games purchases. There is a simple fix for this. Just go to the hard drive where the game was installed. Find the “Electronic Arts” file. Copy the file then paste it to the computer’s “My Documents” file. Then unplug the hard drive from the computer to make sure it’s working. 

First off do NOT follow the advice from mslataprada as it could not be more wrong.

To move the game to another drive you need to uninstall it and when reinstalling specify the new drive as the destination.

The game and packs are tied to the account so will not be lost by reinstalling.

MaddeIsabelle  The only supported way is to uninstall the game and reinstall it where you want it to be.  You can choose the install location on the same initial pop-up where you choose the language and which add-ons to install.

If your internet is slow and you want to try a workaround, move the Sims 4 data to where you want it to be, then tell the EA App to "install" to that location.  It may simply verify the files and complete the install process.  Or it may redownload everything.  This is kind of hit or miss, to the point where I've had it reinstall some packs but not others when I've tested.

Make sure you're moving the Sims 4 folder that contains the game's program files, with subfolders like Data, Delta, and Game.  Don't move the Sims 4 folder that has saves, Tray, Mods, etc.  If you'd like this in another location as well, that's certainly possible, but it's a whole different process and is entirely unrelated to where you've installed the game itself.