How to make destructible HLOD Meshes Like Fortnite?

Hey, I have read this post:

about UE4 HLOD and Proxy Tool to simplifiy static meshes …

However, in the upper link they mentioned that they were able to create a destructible HLOD system to use in fortnite

This system allows u to destroy specific parts of the HLOD mesh when u destroy a real piece of building.

they mentioned at the end of the post that this system was written in C++ and they also have released this tool in ue4 4.20 … however i don’t know how to get, how can i find and use such a tool… …

what i’m trying to do is creating a big world with destructible buildings so we really i need to this tool any help?