Your first link returns a "404 Not Found" message. The second one works well though so I'm guessing it's probably because the first is trying to lead to your logged-in account......

Alternatively, @silvan, you can follow this:

The dataset for this competition is publicly available on Radiant MLHub. In order to access the data, you need to sign up for an API access token here. Then you can access the data using Radiant MLHub API (docs available here). The multi-spectral dataset is named “ref_african_crops_kenya_02_source” and the labels and field IDs dataset is named “ref_african_crops_kenya_02_labels”. You can use these example notebooks to access, download and load the data into your Python environment. Models that use the Field ID as a feature will not be accepted as a winning solution.

~ this can be found in the Data section of the page

Click on the individual links for all that you require.. What you really need are the first and second links as far as getting the data is concerned (though the second link is also important to know what you're about).

And yes, I just visited the link (first) and it has both the login and sign up pages with the buttons present...

oh I see.. that's fine. godspeed