The Sims 4 Updater Work Link

Even with proper setup, issues can occur. Here is how to address them based on community documentation:

Because the tool avoids re-downloading unchanged data, updates are typically a fraction of the full game size. For example, a standard game update requiring a 20GB download via a full installer might only require 500MB–2GB of data via the Updater, depending on the scope of the patch. the sims 4 updater work

Safety and legality are two different things when it comes to this tool. Is it safe from malware? Even with proper setup, issues can occur

Do not download random “Sims 4 updater” executables from ad-ridden mirror sites. The only reliable version is maintained by known community figures (like Anadius on CS RIN or their official Git page). Check the checksum (MD5 hash) if possible. Safety and legality are two different things when