Leonid, please stop giving false info about my modules. It works perfectly on my UNA demo site, appears in "Downloaded" modules in the admin and installs with no errors: http://51.77.58.3/

Also, it's been made based on UNA modules examples and documentation.

Most likely there's an error in your "market" system which doesn't process the payment (I have to add processed payments on demand by hand).

Please look closely at your UNA market functionality and fix it!