Anji. This files is probably already available in your installed files. If you want to get the latest samples, maybe go to: knowledge.autodesk.com/support/revit-products/getting-started/caas/CloudHelp/cloudhelp/2021/ENU/Revit-GetStarted/files/GUID-9E9688A2-0645-4F8E-9D96-F1B76291A6C6-htm.html If not, maybe try here: knowledge.autodesk.com/support/revit-products/getting-started/caas/CloudHelp/cloudhelp/2019/ENU/Revit-GetStarted/files/GUID-61EF2F22-3A1F-4317-B925-1E85F138BE88-htm.html Good luck. Remember, you can always try creating your own simple background (that way you also learn about walls, windows, doors, etc.)