When trying to access Revit 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 family folders and files.
If not, the Revit 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 content (without needing to reinstall the software), see Add or Remove Content.