Reinstall Origin, then try installing your game again.
Click on Uninstall a program under Programs. Re: Sims 4 expansion pack won’t install Open the Control Panel (find it by searching “Control Panel” in the Start menu). If it says Play or Details and has an Installed icon next to it, this means the pack was installed and ready to play. Click the Expansion Packs, Game Packs, or Stuff Packs tab depending on the pack you installed.
Right-click on The Sims 4 base game image and click Show Game Details. Another alternative is to wait however many years in the hope that EA gives it away like they did with the Sims 2 Ultimate Edition a few years back. (A2A – with major reservations about the question) The only legitimate free source for Sims 4 stuff is to have someone gift it to you. Is there a way to get Sims 4 expansion packs for free?