Upload the each of those folders to your forums directory (the directory containing ubbthreads.php)
That'll leave the structure something like
../ubbthreads.php
../cache_builders/rss_topic_creator.php
../languages/english/admin/topic_feeds.php
Then open the txt file and follow the instructions in there. You'll run the one query, replacing %%TABLE_PREFIX%% with the table prefix used at your forums.
You'll then use your trusty text editor (notepad if you have nothing better) to edit a couple of files specified, and then you upload the modified files.
Go to your control panel, click "Topic Feeds" in the left bar, and set the feeds up