About the support for Mac models
Cubism Editor is not supported with Apple M1 processors.
Please refer to System Requirements
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Can't save a project in the free version despite it being within the limitations
The project file was originally started within the free trial. Its resolution was above 2048x2048 but I have since lowered it back down. I can't find anything else in the project that might prevent me from saving it.
Here's a picture of the model statistics.