Torrent file
Although they make a torrent file available:
https://cloudfront-files-1.publicintegrity.org/offshoreleaks/data-csv.zip.torrent
It's just their processed database data in CSV format, 36MB in total:
$ unzip ../offshoreleaks_data-csv.zip
Archive: ../offshoreleaks_data-csv.zip
creating: offshore_leaks_csvs/
inflating: offshore_leaks_csvs/Addresses.csv
inflating: offshore_leaks_csvs/Entities.csv
inflating: offshore_leaks_csvs/Intermediaries.csv
inflating: offshore_leaks_csvs/Officers.csv
inflating: offshore_leaks_csvs/all_edges.csv
$