If you are looking to move beyond this version to the latest 2026 releases: Create a Project File
Spine 3899 Updated – Smooth BGP EVPN Convergence Observed ✅ spine 3899 updated
: Version 3.8.99 is widely used for projects requiring stability in specific runtimes (like Unity, Phaser, or Unreal) that have not yet migrated to Spine 4.0+. Mandatory Re-export : If you are updating from 3.7 to 3.8.99, you must re-export If you are looking to move beyond this
Remember that any file saved directly in 3.8.99 cannot easily be opened by older iterations like 3.8.91 or 3.7 variants without throwing structural schema exceptions. Data Recovery: Rolling Back From 4.x to 3.8.99 This is another issue that will only be
A known issue affects the export of JSON files in 3.8.99: transform constraint offset values (for rotation and movement) may not be properly restored, resulting in differences compared to the original values. This is another issue that will only be addressed in newer versions of Spine.
The updated version introduces three major shifts from the legacy documentation: 1. Enhanced Stress-Strain Tolerances
Multiple bug fixes were implemented between versions 3.8.75 and 3.8.99, addressing various stability and functionality issues. Consequently, users are strongly advised to transition away from older patch versions such as 3.8.75 to minimize potential problems.