Hi Thank you Mitch for your help.
Unfortunately the problem is still existing, I delete the Spine Examples folder, open it in Unity 2019.1.2f1, Then I re-import the Unity 3.7 runtime, the same error still there.
Assets/Spine/spine-unity/Modules/AnimationTools/AnimationTools.cs(215,6): error CS1501: No overload for method SetFrame' takes
4' arguments
I cannot run the Gunman scene in Assets/SpineMen/Scenes.
Maybe the compatibility issue?
The second screenshot shows that all of the Spine examples scene are not rendered properly. The animationtool.cs is the one has problem?