<!-- When requesting a new feature, please explain why it would be useful, and how you would like to use it. A user story is a helpful way of phrasing such a request, see https://en.wikipedia.org/wiki/User_story#Examples --> I suggest to try [roomba](https://github.com/ropenscilabs/roomba) to try and simplify the [download](https://github.com/TIBHannover/BacDiveR/blob/941b8deb700d03ed4ba9e122ac56e270df84ed23/R/retrieve_data.R#L59) [processing](https://github.com/TIBHannover/BacDiveR/blob/master/R/util-aggregate_datasets.R) code.
I suggest to try roomba to try and simplify the download processing code.