@bluemystral Do you use a VPN? If so, please disable it.
If that doesn't help, do you already have the free holiday pack on your account? Adding free content can sometimes fix an account issue, and while I don't know that this is definitely an account issue, it's an easy test. If you've already added the holiday pack, try starting to download Apex Legends, which is also free. You don't need to let the download go through; the point is to see whether it works at all. If it does, cancel the download, then try installing Sims 4 again.
If this doesn't help either, please uninstall the EA App with Revo Uninstaller (the free version is fine). Revo will clean out some temp files that a regular uninstall misses. Then restart your computer, reinstall the App, and try to download Sims 4 into another new folder, again on the root level of the drive of your choice.
One other thing worth trying, if nothing else works, is using a different network. Since you have a laptop, you could take it to a friend's house or somewhere with public wifi. The idea here is to see whether the problem is actually the network, as opposed to the various other possibilities.
@jdurrante Please try the other suggestions in this thread.