Some times, when you installed Revit 2021, you have missing templates or libraries files.

below you can download them

• click on the preferred missing library
• download the file from Autodesk drive
• Extract the file
• copy the file to C:\ProgramData\Autodesk\RVT 2021
• select where too paste. in Templates file for Templates.  in Libraries file for Libraries

Metric Library

Imperial Library

[pexcirclecta pex_attr_small_title=”The Best Revit Course” pex_attr_title=”Autodesk Revit Architecture Course” pex_attr_button_text=”Register Now” pex_attr_button_link=”https://omniplan.me/omni-courses/revit-architecture-daily-3/” pex_attr_button_link_open=”new” pex_attr_button_color=””][/pexcirclecta]

  for other Libraries

visit  Autodesk libraries