Unofficial Skyrim Legendary Edition Patch issue (The Elder Scrolls 5: Skyrim)

Loot writes to me that
This plugin requires the "Dawnguard.esm" plugin to be plugged in, but it is not plugged in.

This plugin requires the "HearthFires.esm" plugin to be enabled, but it is not enabled.

This plugin requires the "Dragonborn.esm" plugin to be enabled, but it is not enabled.

And how to connect it?