Navigate to . Look for the entry labeled "Spine 3899". If the build number is 3.8.9.9-Rev.1 or earlier, you are due for an update.
Spine 3.8.99 was the final major release of the 3.8 branch before the transition to Spine 4.0, which introduced a completely new curve editor and technical architecture. Many projects remain on 3.8.99 to avoid the significant breaking changes required for a 4.0 upgrade. Key Technical Insights Unity Integration spine 3899 updated
No. Once you save a .spine project with build 3899, older editors (e.g., build 3500) will display a "file too new" warning. Always version-control your files if you collaborate with artists using different builds. Navigate to