Thank you! That worked for me.

I've downloaded the trial version of Spine to test whether it works with Game Maker Studio. Apparently it doesn't, as I get "invalid JSON" error messages when I try to import the example files into GMS.

It's occurred to me that GMS might not have support for the newest version of Spine. This article (https://help.yoyogames.com/hc/en-us/articles/360018864552-Updating-Spine-Sprites-For-GMStudio-2-2-2-Using-Spine-3-7) suggests that I might need Spine 3.7. However, there appears to be no way to obtain a trial version of Spine 3.7, since the Spine trial is always the latest version.

How can I verify that Spine 3.7 works with GMS before I commit $70?