Looking at your error, this is a version mismatch issue between your spine-unity package and the URP Shaders UPM package.
The key thing to check is whether you have the latest spine-unity 4.2 package AND the latest URP Shaders package — both need to be up to date together, as they have dependencies on each other.
The latest available versions are:
You can also install via git URL in the Unity Package Manager:
For spine-unity:
https://github.com/EsotericSoftware/spine-runtimes.git?path=spine-unity/Assets/Spine#4.2
For the URP shaders (requires spine-unity installed via UPM):
https://github.com/EsotericSoftware/spine-runtimes.git?path=spine-unity/Modules/com.esotericsoftware.spine.urp-shaders#4.2
Since you mentioned you updated to the version uploaded in May, that would explain the issue — the URP shaders package was updated more recently (October 2025). Make sure both packages are at their latest versions and the errors should be resolved. If errors persist after updating, please share the actual error messages so we can diagnose further.
