Hi,
IndieDoroid написавIs there a quick way to fix this besides re-exporting all my 3.7 Spine characters? :scared:
We are sorry for the troubles.
Please note that the Spine-Unity runtime version (e.g. 3.7) has to match the Spine Editor version (e.g. 3.7.93) which was used to export your skeleton files. When major+minor version numbers do not match (3.7 assets vs 3.8 spine-unity runtime) as in your case, import in Unity will fail due to format incompatibility.
You can use batch-export to re-export all your skeletons quickly via the command line interface:
Export - Spine User Guide: Command line
Apart from re-exporting I see no way to make the 3.7 assets usable in the Spine-Unity 3.8 runtime, sorry.
In case you don't have the original project files any more, you can still use Import Data..
to import the 3.7 assets in Spine and re-export them.
If you want to stick to 3.7 assets, I fear there is no way apart from using the Spine-Unity 3.7 runtime - we do not recommend that in your case however.
I have created a Spine 3.7 to 3.8 upgrade guide here:
Spine-Unity 3.7 to 3.8 Upgrade Guide
Hope it saves you some troubles!