We have a "JSON rollback" tool which can go from 3.8.xx -> 3.7.94 or 3.3.xx -> 2.1.27. Unfortunately we don't have 3.7.xx -> 3.6.xx. I don't remember the difference in the JSON between those versions. It may be that they are very similar. If you try loading your 3.7 data in 3.6, you may be able to tell where it fails and then manually edit the JSON until it is accepted by 3.6.
我们有一个“ JSON rollback ”工具，可以从3.8.xx -> 3.7.94或3.3.xx -> 2.1.27。 不幸的是我们没有3.7.xx -> 3.6.xx。 我不记得这些版本之间JSON的区别。 它们可能非常相似。 如果尝试在3.6中加载3.7数据，则可以判断出失败的地方，然后手动编辑JSON，直到被3.6接受为止。
Forum thread about JsonRollback:
有关JsonRollback的论坛主题：
Spine editor and runtime version management
JsonRollback source code (it just makes changes to the JSON):
JsonRollback源代码（它只是对JSON进行了更改）：
spine-runtimes/JsonRollback.java at 3.8
Sorry I don't have a better answer!
对不起，我没有更好的答案！
