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You cannot. Spine is not backwards compatible . A file saved in 4.0 uses a different JSON schema and physics data. If you need to work in 3.8.99, you must keep all source files saved in the 3.8 format. Consider using a version control system (Git) with separate branches for legacy work. Spine 3.8.99 Download
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. Because it is a legacy version, it is not the default download on the official site but is accessible via the Spine Launcher : Download and install the latest Spine Launcher for your OS. : Open the launcher and click the (gear icon) or the version number currently displayed. "Other..." from the dropdown menu and manually type A file saved in 4