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[About Cubism Editor / SDK 5.4 Alpha](Updated: July 14, 2026)
You can download the alpha installer from the dedicated forum below.
If you have any feedback regarding the alpha version, including feature requests or bug reports, please use the same forum.
Cubism Editor / SDK 5.4 Alpha Forum
https://creatorsforum.live2d.com/c/cubismeditorsdk54alpha/
[Regarding macOS Tahoe](Updated October 16, 2025)
macOS v26 Tahoe is now supported!
We advise against upgrading your macOS at this time as it may cause Live2D products not to function correctly.
Upgrading macOS can also cause you to lose your Cubism Editor license file.
Please make sure to deactivate your Cubism Editor license before upgrading the macOS.
For more details:
https://help.live2d.com/en/other/other_09/
You can download the alpha installer from the dedicated forum below.
If you have any feedback regarding the alpha version, including feature requests or bug reports, please use the same forum.
Cubism Editor / SDK 5.4 Alpha Forum
https://creatorsforum.live2d.com/c/cubismeditorsdk54alpha/
[Regarding macOS Tahoe](Updated October 16, 2025)
macOS v26 Tahoe is now supported!
We advise against upgrading your macOS at this time as it may cause Live2D products not to function correctly.
Upgrading macOS can also cause you to lose your Cubism Editor license file.
Please make sure to deactivate your Cubism Editor license before upgrading the macOS.
For more details:
https://help.live2d.com/en/other/other_09/
For inquiries regarding issues with license purchases or license activation errors, please contact us through the email form.
Don't close windows without restoring them
Steps to reproduce in Live2D Cubism Editor 5.3.04 (sorry if this is already fixed in the 5.4 alpha):
1) Open any Apply 3D Expression Rotation, Auto Generation of Sway Motion, Options for Paste Form Special windows, Extended Motion, etc... window
2) Go into Mesh edit mode (the windows will be closed)
3) Exit Mesh edit Mode (the windows will NOT be re-opened)
Please just disable the windows instead of closing them, but if you must close them at least restore them when leaving edit mode! This is such a waste of time!
It's possible this happens with more modes as well, but mesh editing is very common so I am always fighting to restore my windows.
1) Open any Apply 3D Expression Rotation, Auto Generation of Sway Motion, Options for Paste Form Special windows, Extended Motion, etc... window
2) Go into Mesh edit mode (the windows will be closed)
3) Exit Mesh edit Mode (the windows will NOT be re-opened)
Please just disable the windows instead of closing them, but if you must close them at least restore them when leaving edit mode! This is such a waste of time!
It's possible this happens with more modes as well, but mesh editing is very common so I am always fighting to restore my windows.