Erikari wroteIn your editor click on the Spine logo>preferences (or hitF12) then choose the preferred Spine version from the dropdown menu (it should be one of the first) instead of "latest". Confirm and then restart Spine. (:
Thanks for the answer, but I'm completely new to Spine, where can I find this "Spine logo"?
Btw I got version "Spine-Unity 3.5 for Unity 5.4-2017.1" working with Unity 3.5.7 by editing a 2 lines of code in SpineSpriteShaderGUI.cs, only needed to add ".text" after "smoothnessScaleText" and "smoothnessText", as the method was expecting string, not GUIContent.