"Spine 41 download 2021" refers to the Spine 2D 4.1 animation software beta, which became available in late 2021 and introduced key features like layered animation and expanded runtime support. The update, which followed the 4.0 release in July 2021, is accessed via the Spine Launcher by selecting the beta channel. Spine 4.0 is here! - Spine Forum
: Standardized 64-bit support across all platforms to eliminate "out of memory" errors and improve performance. Important Compatibility Notes Blog: Spine 4.1 released spine 41 download 2021
If you mean Spine 4.1 (released 2021), here are its major proper features: "Spine 41 download 2021" refers to the Spine 2D 4