The downlaodlinks will not work right away. Follow the here listed Options to make them work:
For instant downlaod:
If you do not have an account with a Hubzilla Channel jet, register fist on one of the public Hubs im.allmendenetz.de/pubsites.
Log in with your Hubzilla Channel, go to im.allmendenetz.de/cart/ehma/catalog, do the payment by paypal, go back to this page and get the download.
For downlaod with in 24h:
Contact and follow the Channel im.allmendenetz.de/@ehma by your Fediverse Channel. You will get an access token for the downlaodlinks posted within 24h.