The Helpfile for the SAP Cloud Applications Studio states, that one needs an S-user to download it from the service market place.
Customer support says, as a ByDesign-customer, you don't get a S-User. This is only for ERP-Customers and so on...
Dear Mr Spiekermann,
Thank you for your reply.
I have checked your customer number and there is only a Business byDesign installation listed.
Please be aware, for support regarding Business byDesign you will need to contact the Cloud Support team as we do not handle these queries.
As you do not have any on premise installations, you will not be able to register for an S User Id.
Thank you for your understanding.
Kind Regards,
Orla Concannon
Support Associate, SAP Active Global Support