From what I can gather on the free WordPress blogs they do not support plugins which are not installed default. You either have to upgrade to the paid version to be able to install any plugin you want or pay for hosting elsewhere. There may be free hosts out there that the plugin would run on but I would not do it because they would shut your site down. On most free host and some shared hosts they have in the TOS that bittorrent sites are not allowed because the resources that some torrents sites use would put a burden on the server which is probably already overloaded from other sites they put on that server. Also another problem you may run into with some free host and even some shared host is their settings for php. At the moment somethings in your hosting need to be turned off like SecFilterEngine and safe mode. There may be a couple other things but those are the two things that i know for certain will cause problems.
