#1115 – Unknown character set: ‘utf8mb4’

WordPress does not support MySQL 4 :

To run WordPress your host just needs a couple of things:

MySQL version 5.0 or greater (recommended: MySQL 5.5 or greater)

https://wordpress.org/about/requirements/

While the utf8mb4 encoding is recent change and you might work around it, overall you still need compatible MySQL version.

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