I knew this tree already.
I can import it with no problem.
Please, can you run Sweet Home 3D from a Terminal window and see if there's any error?
By the way, for models coming from Google 3D Warehouse, please prefer to provide a link to the page where the SKP/DAE/Collada model can be found and do not copy the models in a Sweet Home 3D attachment.
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Emmanuel Puybaret, Sweet Home 3D creator
