Make sure you upgrade all of the packages at the same time. Media Encoder is shared by Premier Pro, After Effects etc, but has to be a compatible version with Character Animator. So basically I suggest update all or nothing, never update one package and not the others.
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when character animator give you message install media encoder that means your character animator is higher version than media encoder, download media encoder latest version, it will be open, yesterday i face same problem, now my problem is fixed, but now my problem is media encoder opening when i'm exporting from charecter anmator but can't dynamik link from animator, that's why i can't export