INSTALL

Before enabling the module please be sure to copy the following files to the Drupal site root directory:
  - announce.php
  - scrape.php

Upload module needs to be configured to allow users to upload .torrent files. Visit admin/settings/uploads
in your browser and add "torrent" to the "Default permitted file extensions" For the roles that have 
permission to upload torrents.

To redirect requests from "/announce" to "/announce.php" add the following to the .htaccess file above the other rewrite rules.
  RewriteCond $1 announce$
  RewriteRule ^(.*)$ /announce.php [L]

UPDATE

You can update from one of them versions:
6.x-9.0-beta1	2009-Feb-26
6.x-9.x-dev	2009-Mar-27

Steps:
0) Goto "admin/build/modules" and enable "FileField" module.
1) Delete whole existent "bittorrent" folder (from "modules" folder) and delete "announce.php", "scrape.php" and "bt_common.inc" from drupal site root folder.
2) Copy new "bittorrent" folder to the same place (into "modules" folder) and copy new "announce.php" and "scrape.php" to drupal site root folder.
3) Open "update.php" ( http://example.com/update.php ) in your browser.
4) Follow to instructions. Then press "Continue" button.
5) Expand "Select versions" group and check that "bt_torrent module" set to "6900" and "bt_tracker module" set to "6900".
6) Press "Update" button.