When trying to access Revit LT family files, you may encounter a problem locating the files.
Issue: By default, family files are typically stored in a location like the following:
Navigate to that location and see if it contains Revit LT family folders and files.
If not, the Revit LT content (including doors, windows, project templates, and so on) was not installed properly. (This issue can occur when you have a slow internet connection while installing the software.)
Solution: To install the Revit LT content (without needing to reinstall the software), see Download and Install Revit Content.