The Blender file is set up to be used as an external asset for your scene. To use it, copy the "Tall_Firs_Cycles.blend" file with the textures to your project folder.

You can then use the File > Link... command to link in the collections that start with the "LINK" prefix.

Go to File > Link...

Navigate to the "Talls_Firs_Cycles.blend" file

Find the Collections folder in the .blend file

Link in any collections starting with the "LINK" prefix

Needles will be visible when rendering as a viewport performance optimization