This version has major changes to the Spine integration for Defold. Check the official forum thread for more information.
This new version can be downloaded by opening Defold and allowing the editor to self-update.
All releases can be downloaded at: https://github.com/defold/defold/releases
Official forum thread with complete update notes: https://forum.defold.com/t/defold-1-3-0-has-been-released/70493
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