Characterizer is not available even though Character Animator is up to date. Reason?
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Just to confirm, does the menu bar say “Version 2.0” or “Version 2.0.1”?
If it says “Version 1.1”, “Version 1.1.1”, or “Version 1.5”, what is your OS version? Here are the system requirements: https://helpx.adobe.com/adobe-character-animator/system-requirements.html
If it says “Version 1.0.6” or earlier, you are using the Beta or Preview version of Character Animator. There is a separate “Character Animator CC” entry in the Creative Cloud application to install, separate from “Character Animator CC (Beta)”.