Released in January 2021, version 1.16.5 was a critical stability update that fixed major server crash bugs. It became a "gold standard" for the modding community for several reasons:
Launch a standard 1.16.5 Minecraft instance (often using the SKLauncher or the official launcher). Troxill Client for Minecraft 1.16.5
Simply installing the client isn’t enough. Here are optimal settings for different scenarios: Released in January 2021, version 1