There is no practical way of providing an acceptable Win10-Experience (including Semi-Annual WaaS Updates) on a 20GB Disk. Even the 40GB Disk of VPS 500 will be too small. There are plenty of advices here and otherwhere on the web how to "cleanup" Windows. But I would never ever start a new project based on these "cleanup-tricks". Calculate a 60GB Disk as minimum - otherwise you have to deal with Semi-Annual fresh reinstallations.
Other Question: You said "you like to provide Win10 as cheap as possible on your site". Seems you like to offer these Machines to others? How are you planning to license these Machines? AFAIK there is no Windows-Licensing offered by Netcup, and I cannot see how you can license a Win10-Machine running on a virtual Server-Infrastructure which is not under your control without breaking the Microsoft policies.
Thanks,
Yes, it's not an option to install Windows 10 on 20GB or even 40GB, So a dedicated server will be needed to do the job.
I will only be supplying the free trial Microsoft operating systems which will need to be activated by the user when the free trial period expires. Are you saying that it is not possible to host Windows 10 machines on the netcup network because it is not possible for customers to license them using their own keys?
.. a great reply gunnarh
Thanks