Nate Do you mean the list of version on the settings dialog? Settings - Spine User Guide: Version The settings dialog shows the versions for the update files from your Spine user folder that you downloaded previously. You aren't limited to those versions though, you can click Other... and type any version you want.
Erika Hello, what version of Spine was the json exported with? You may need to use the rollback tool to make the json compatible, for example you accidentally used beta instead: Open project in an older version