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: Moving data from 3.8.99 to 4.0+ is a one-way process; once a project is saved in a newer version, it generally cannot be opened back in 3.8.99. Launcher Issues
: The legacy launcher cannot cleanly check authentication endpoints meant for modern versions. Licensed users must configure their active launcher to explicitly select the 3.8.99 version drop-down menu in the settings panel rather than downloading disconnected standalone installers. spine 3899 updated