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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.
Live2D Cubism Editor crashing on startup
Software Version: Cubism Editor 4.1.04
OS: Windows 10
PC Model: OMEN 16 Laptop
Graphics: AMD Radeon RX 6600M
CPU: AMD Ryzen 7 5800H
Memory: 16GB
Illustration Software: Photoshop
I have just installed Live2D Cubism Editor 4.1.04, however anytime I launch, an error box pops up saying "Sorry, an error occured at startup." I have tried earlier versions and they give the same result.
Comments
Thank you for your contact.
This is Live2D Support.
We apologize for any inconvenience this may cause.
Windows custom themes may be affected.
Could you please check if the software works properly with the custom theme in its default state?
Please try reinstalling the Cubism Editor and see how it behaves.
Please note that inquiries from the official website will be omitted with this reply.
If you are not using the site's contact form, please let us know.
We appreciate your cooperation
Thank you.
I have tried it with a default system theme, and it works and opens. Thank you very much for the response