Since the dataset provided by Open-MaStR doesn't seem to get updated anymore and only uploads CSV files I will provide a monthly updated database instead. Like the original publication the data set contains all data from the Marktstammdatenregister. The data set is downloaded and processed with the software open-MaStR. If you don't have much experience dealing with databases directly a simple way to interact with the data set is using DB Browser for SQLite. Simply open the file there and you are able to browse all tables included in the dataset. This also allows exporting individual tables as CSV files. License information: Marktstammdatenregister - © Bundesnetzagentur für Elektrizität, Gas, Telekommunikation, Post und Eisenbahnen | DL-DE-BY-2.0