It's a tar file with all the files already in it (I had a peek inside the tar file).
The command to start it looks like utserver
inside ./utorrent-server-v3_0
utserver: ELF 32-bit LSB executable, Intel 80386, version 1 (SYSV), dynamically linked (uses shared libs), for GNU/Linux 2.6.15, not stripped
Also have a look at ./utorrent-server-v3_0/docs/
for the file uTorrent_Server.html
.
If you are looking for the client you need wine
to run it. I would advice looking for another client. Both deluge and transmission are perfect for downloading torrents.