Dear,
First of all,those families are called Autodesk default library note system families.Anyway if you want to redownload those families,go to add/remove software and then search for autodesk library,then click uninstall/modify,a panel will appear so you can select the library you want to download.
Kindly if this solved your issue mark as solution to help others
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Mahmoud Zeidan
BIM Manager/Mechanical Engineer
