The new Getty Provenance Index can be confusing to use. Here are some tips for advanced search and download on the new GPI
https://www.youtube.com/watch?v=Vbf0QjHWQ_8
Demo:- simple search on Pinakos,
- selection of provenance activity facet
- narrowing to a specific art market actor, (Swiss art dealer Fritz Nathan)
- download into CSV file of the five artworks that Fritz Nathan sold to Pinakos and Knoedler (who acquired jointly)
Tip: Downloading works if you don't select the optional "Export as system values".
(In the videos I keep the mistakes so that viewer can recognize them and not panic if they make the same.)