Mojave is a supported operating system since Illustrator version 23.×.
We request your help. Please get in touch with us at any of the other support channels – https://helpx.adobe.com/support.html . Since this is not a generic issue that we can reproduce at our end, we will need someone to look into your machine to figure out what is going on here.
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Illustrator 2019 on Mac Mojave freezes when i try to create a new document or open an existing document.