Revit 2024 Family Library Location
C:\programdata\autodesk\product (revit 20xx), unless a different location is. If you want to local revit family content, you have to.

Can’t locate downloaded revit 2024 families on my c drive. Family browser is a dynamic interface;
Install Additional Revit Content Libraries.
Can't locate downloaded revit 2024 families on my c drive.
These Are Stored In The Library Folder, Typically Located At C:\Programdata\Autodesk\Rvt.
Family browser is a dynamic interface;
Images References :
Since Revit 2022, The Default Family Are All Cloud Base.
By default, family files are typically stored in a location like the following:
Revit Content Varies Depending On The Content Library Being Installed.
Family browser stays up to date with any changes made in windows explorer.