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Pokémon Essentials v19 has been released! It brings a lot of fundamental changes to Essentials, including the switch from using RGSS to using mkxp-z, and all the performance improvements thereof. There has been a lot of restructuring of code, and added support for third party scripts (plugins) and general code quality. It lays the foundation for a lot of exciting future developments, and still manages to add some useful features such as a better encounters.txt format and large events.
You can read the change log to learn more about what has been done in v19. This wiki cannot provide any download links.