Hi guys,
I've just bought Spine 2D and encountered the same problem.
When i use the script i got Save As window opened and asked to save the image as Image-Copy.psd ...
I see that there is no response to this thread since 7 months.
Any idea how can i fix that ?
I am using Windows 10 and Photoshop CC 2014.0.0 - 20140508.r.58 x64
Please help - this is really frustrating.

Ok guys i've made a fix that seems to work for me. You can try it.
It is too late and i dont have much time to test it in different scenarios but the export seems to work fine.
The problem was that we need to use activeDocument.exportDocument(...), instead of activeDocument.SaveAs.