I'm in the same boat. I just installed RevitLT 2023 and can't find families.
When I look for the files through file explorer: C:\Program Files\Autodesk\Revit LT 2023\en-US
I reach FamilyRes.dll, and no .rfa files.
When I use filepath in Explorer mentioned in Message 3: C:\ProgramData\Autodesk\RVT 2023\Libraries\US Imperial
my computer can't find it.
In Revit, when I search under Component --> Mode --> Load families, the folder is empty under filepath
C:\Program Files\Autodesk\Revit LT 2023\Templates\English-Imperial
When I download, install, and restart revit with English content file from the link in Message 2,
https://knowledge.autodesk.com/support/revit/downloads/caas/downloads/content/autodesk-revit-2023-co...
the all of the above - through File Explorer and through Revit Load Family - happens the same.
So far, Forum and Autodesk answers have not led to a solution.