The mod (originally by losson370 and later updated/maintained by creators like arkeus17 ) is designed to bypass the game’s standard limits on how many Sims can appear on a lot at once.
: Some versions or related tools (like MC Command Center ) allow the game to pull Sims directly from your personal library to act as these spawned NPCs, rather than generating random new ones. More Sims In The World
: Standard gameplay limits households to 8 Sims; expanding this beyond the limit (often via MCCC ) can cause issues when entering "Create A Sim" (CAS) mode. the sims just posted the roadmap for this summer! More Sims In The World