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Where root location of Twinmotion Materials for Unreal Engine?

Hi
I download Twinmotion Materials for Unreal Engine

After Add to Project, I can find folder of Twinmotion material in Project folder. The size of folder is around 9GB.

I wonder Where root location of this “Twinmotion Materials for Unreal Engine” in hard drive?
If I create new project, do I need to download “Twinmotion Materials for Unreal Engine” again?

Thank
Travis