This is the problem with the "new" marketplace. Developers only way to make profit now is to use the (in my opinion) obsolete and step backward admin marketplace built into IPS. You can no longer download files and save them even if you are the owner of a license (which you have the rights to according to some EU country laws). Of everything bloaty and unnecessary features IPS have done during the last years this marketplace is by far the worst and probably also the reason to why no other software have this, they usually provide both solutions.
Honestly IPS need to rethink how they provide plugins to license holders, not only for their developers that keep the software updated with plugins and features that by far succeed even main features of IPS, but also from a legal stand point. Otherwise they will have to limit the marketplace and only give access to certain regions if the wrong person catches on and is having a bad day.
Me personally, don't know anything about coding. I am however a good graphics designer. But I can't contribute to the community due said limits in the marketplace. It is sad and quite frustrating.
But what do I know, I only pay for my license and look happy. Why should IPS care what paying customers think?...