Unavailable for downloading themes

I’ve got some real problem. On the pling.com resource there are huge amount of very good icon themes. But 70 - 80% of them are dead (unavailable for download). And there is no way to get them. Even from external resources.
We need some kind of checkbox in search form that let us exclude “dead” results from output.

… For me it is very sad to see so many great themes unavaluable: