Skeleton Viewer is not packaged as a standalone application because it is just a simple example tool based on spine-libgdx. While it's useful for verifying skeleton data with the reference runtime, spine-libgdx, it's not intended for production use.
Note the Skeleton Viewer source is provided and it can be extended or used as an example to build your own tools. Many users do that because it gives the advantage of customization and application specific integration, such as more thorough testing, visualizations (eg particles), event handling, or association with game data.
As described in the thread Luke linked, Java should never be "installed". Instead, get the latest Java from Adoptium or Zulu, extract it to a folder, and run it from there. I've updated the Skeleton Viewer page with this.
I actually forgot about being able to start Skeleton Viewer from the Spine editor. :wounded: We'll add that today, though it will require starting Spine from the command line using `
skeleton-vieweror
sv`.
You can use `
skeleton-vieweror
sv` in 4.1.12+, but you will need the latest Spine launcher. 4.1.12 is available now. More info here:
Skeleton Viewer: Run from Spine