droptimal написав"Sorry, an error occurred while reading the project file. Please note that projects which have been saved with an older version of Spine cannot be opened by an older Spine version."
This error message says "an error occurred while reading the project file". You need to export JSON from 3.8.11-beta, then open 3.8.95 (or 3.8.96, released yesterday) and choose Data Import to import the JSON. It will not work to choose Open project and try to open the JSON file, as it is Spine JSON data and not a Spine project file.
Mario написавYou can't open a Spine project or JSON export from a new Spine Editor version in an old Spine Editor version.
Mario is correct about Spine project files, however for JSON you can export from a newer editor version and import the JSON into an older editor version IF both the versions differ only in the patch version (ie have the same major and minor version numbers). Note that the full version is in the format major.minor.patch. If the major or minor version is different (eg 3.8 to 3.7), it may still work but is not officially supported.
