Large-scale mods can add gameplay features similar to expansions, such as the First Snow Mod which adds winter weather.
This involves downloading a small program (often called "Sims 4 Updater" or "Anadius DLC Unlocker") that tricks the EA App into thinking you own the DLC. You then download the base game legally and let the unlocker activate the paid files. sims 4 expansion packs free download windows