Hi, Tigran! Looks like this vendor doesn't maintain its website. His plugis have been deleted. Thanks a lot!
We alrady have a huge list of changes prepared for our markteplace. It contains really a lot of things such as better moderation, more strict requirements for listing, quality testing, built-in support for downloading from nopCommerce admin area, etc, etc. But right now there's no specific estimate on when we release them.
Also, can you consider making all the plugins to be easily uploaded and installed on the admin side, since some plugins aren't configurable thus giving us 'no descriptor found'.