Artists attach 2D textures (arms, legs, torsos) to a digital bone structure.
If you are working on a legacy project or a specific engine branch that requires the 3.8 runtime, Spine Pro v3.8.75 Spine Pro v3.8.75.zip
This is the best place to start. Esoteric Software offers a fully functional, free trial of Spine directly from its official website, which you can download for Windows, Mac, or Linux. The trial includes every professional feature of the software, allowing you to explore the editor, learn its tools, and create animations. The only limitation is that you cannot save your projects or export the data. However, for the purpose of learning the software and testing if it fits your workflow, it's perfect. This is a completely safe and legitimate way to get hands-on experience. Artists attach 2D textures (arms, legs, torsos) to