Attempting to use families from newer Revit versions (e.g., 2022) in Revit 2018 will not work. You must have 2018-specific content.
After installing, you should tell Revit exactly where to find its new content: download revit family library 2018
Once the files are extracted onto your hard drive, you must tell Revit 2018 where to find them. Launch . Attempting to use families from newer Revit versions (e
: Run the downloaded .exe file as an administrator to extract the files to the default path: C:\ProgramData\Autodesk\RVT 2018 . Free Additional 2018.1 Content download revit family library 2018
C:\ProgramData\Autodesk\RVT 2018\Libraries\US Imperial\
Open the Windows and navigate to Programs and Features .