usamaninja Thank you for providing the spine.log file. However, it appears that the forum’s automatic processing did not work as intended, and your license information remained in the attached file. I have deleted the original file and reposted only its contents.
The launcher you are using appears to be the latest version, so this may be a compatibility issue between the editor and your system environment. That said, your initial inquiry was regarding Spine 3.8.99, but the log indicates that you attempted to open Spine 3.7.94. Does the same crash occur when using version 3.7 as well?
Please also note that while your OS (macOS 15.5) is the latest version, Spine 3.7 was released when macOS 10.14 Mojave was current. As such, it is not fully guaranteed to work on recent operating systems. In particular, Spine 4.0 and later support Apple Silicon natively, whereas earlier versions require Rosetta 2. If you have not installed Rosetta 2 yet, doing so may be necessary.
