As the final version of the 3.8 branch, 3.8.99 is extremely stable, with years of bug fixes solidified.
Spine 3.8.99 is arguably the most compatible version across the ecosystem. Whether you are using , Cocos2d-x , GameMaker , or PixiJS , the 3.8 runtimes are mature and virtually bug-free. Spine 3.8.99
If you are migrating a project from Spine 3.6.53 (or an earlier version) to 3.8.99, the process can be performed through the command‑line interface (CLI) or the editor itself. The recommended steps are: As the final version of the 3
A curious interface bug was identified in version 3.8.99: when selecting several bones first and then binding them to an image, the first bone shows as not bound to the image, whereas child bones can be bound correctly. This issue was acknowledged as a known problem that had already seen improvements in later versions. Since version 3.8 is no longer maintained, the recommended solution is to upgrade to a newer version of Spine if possible. For teams that absolutely cannot upgrade, the workaround is to bind bones one at a time or to reorder the selection to ensure that the desired root bone is not the first in the selection set. If you are migrating a project from Spine 3
The launcher will download the legacy binaries and open the exact 3.8.99 interface. The Golden Rule: No Down-Saving