The Sims 4: Deluxe Edition V1.88.213.1030 -

This was the headline feature. Players could finally assign custom pronouns (They/Them, etc.) to their Sims via Create-A-Sim (CAS).

Most modern mods (like MC Command Center or UI Cheats Extension) will not work with this version. You would need to find "legacy" versions of those mods from mid-2022. The Sims 4: Deluxe Edition v1.88.213.1030

Stable, but technically "Legacy" by today's standards. This was the headline feature