目前项目在unity5.4.3版本下开发，美术用了spine最新版本做的素材导入后提示版本不对 想问下是需要用旧版本的spine来处理素材吗 如果的是的话 请问 在哪下载spine的历代旧版本
Skeleton 'NPC_23.skel' (exported with Spine 3.8.85) may be incompatible with your runtime version: spine-unity v3.5
UnityEngine.Debug:LogWarningFormat(String, Object[])
Spine.Unity.Editor.SpineEditorUtilities:IsSpineData(TextAsset) (at Assets/spine-unity/Editor/SpineEditorUtilities.cs:1248)
Spine.Unity.Editor.SpineEditorUtilities:ImportSpineContent(String[], Boolean) (at Assets/spine-unity/Editor/SpineEditorUtilities.cs:576)
Spine.Unity.Editor.SpineEditorUtilities:OnPostprocessAllAssets(String[], String[], String[], String[]) (at Assets/spine-unity/Editor/SpineEditorUtilities.cs:549)
UnityEditor.AssetPostprocessingInternal:PostprocessAllAssets(String[], String[], String[], String[], String[])
IndexOutOfRangeException: Array index is out of range.
Spine.SkeletonBinary.ReadSkeletonData (System.IO.Stream input) (at Assets/spine-csharp/SkeletonBinary.cs:170)
Spine.Unity.Editor.SpineEditorUtilities.AddRequiredAtlasRegionsFromBinary (System.String skeletonDataPath, System.Collections.Generic.List`1 requiredPaths) (at Assets/spine-unity/Editor/SpineEditorUtilities.cs:817)
Spine.Unity.Editor.SpineEditorUtilities.GetRequiredAtlasRegions (System.String skeletonDataPath) (at Assets/spine-unity/Editor/SpineEditorUtilities.cs:825)
Spine.Unity.Editor.SpineEditorUtilities.ImportSpineContent (System.String[] imported, Boolean reimport) (at Assets/spine-unity/Editor/SpineEditorUtilities.cs:605)
Spine.Unity.Editor.SpineEditorUtilities.OnPostprocessAllAssets (System.String[] imported, System.String[] deleted, System.String[] moved, System.String[] movedFromAssetPaths) (at Assets/spine-unity/Editor/SpineEditorUtilities.cs:549)
System.Reflection.MonoMethod.Invoke (System.Object obj, BindingFlags invokeAttr, System.Reflection.Binder binder, System.Object[] parameters, System.Globalization.CultureInfo culture) (at /Users/builduser/buildslave/mono/build/mcs/class/corlib/System.Reflection/MonoMethod.cs:222)
Rethrow as TargetInvocationException: Exception has been thrown by the target of an invocation.
System.Reflection.MonoMethod.Invoke (System.Object obj, BindingFlags invokeAttr, System.Reflection.Binder binder, System.Object[] parameters, System.Globalization.CultureInfo culture) (at /Users/builduser/buildslave/mono/build/mcs/class/corlib/System.Reflection/MonoMethod.cs:232)
System.Reflection.MethodBase.Invoke (System.Object obj, System.Object[] parameters) (at /Users/builduser/buildslave/mono/build/mcs/class/corlib/System.Reflection/MethodBase.cs:115)
UnityEditor.AssetPostprocessingInternal.PostprocessAllAssets (System.String[] importedAssets, System.String[] addedAssets, System.String[] deletedAssets, System.String[] movedAssets, System.String[] movedFromPathAssets) (at C:/buildslave/unity/build/Editor/Mono/AssetPostprocessor.cs:27)
