To open multiple instances of Spine on macOS, you can use the Terminal command open -n -a /Applications/Spine/Spine.app. This command should allow you to run multiple instances of the application. If you are encountering an error when trying to do this, it might be helpful to check the error message for more details. Sometimes, issues can arise from corrupted files or conflicts with other software, such as virus scanners. Ensure that your Spine installation is not corrupted and that no other software is interfering with its operation. If the problem persists, you might want to try reinstalling Spine or checking for any updates that might address the issue.
