Library Update Utility.

Library Update Utility.

Does anyone have a link to documentation regarding the Library Update Utility.  All I can find is below:
  1. Official documentation from Microvellum coming soon! 
What I am looking for is information about what it does / does not overwrite when the utility is used.  Will I use all my customizations (i.e. drawing tokens, custom products, added hardware, materials) and be left with an updated yet completely stock library?

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