To ensure downloaded details appear at the top of your Project Browser in an active Revit model, adjust the browser organization settings by following these steps:
Open the Project Model.
Right-click the Project Browser and select Browser Organization Settings.
Edit View-Browser Organization and go to the Grouping and Sorting tab.
Set the Top "Group By" Option to a customizable project parameter.
If you do not have a customized project parameter in your model, you will need to create a new project or shared parameter with a data type as text.
Click OK, then Apply, and OK again.
Now, when you download details from Pirros, they will automatically appear under the PIRROS IMPORTS section at the top of your Project Browser.