Step by step how to buy videos:
Fore buy video's from 26/04 to 06/05:
Go to: https://vimeo.com/ondemand/jumpinglummen/
Fore buy video's from 07/05 and 09/05 to 14/05:
Go to: https://vimeo.com/ondemand/weekdrie/
Enter the name of the rider in the upper right corner of the vimeo website and click on search.
On the next window select Videos, such as below.
You now see all your videos and you can buy them or rent for 24 h.
Thanks Jumping Lummen.