For the correct function of the plugin you'll need the script from bot-trap.de, which you can get there after a registration and introduction on the forum (Forum in German).
The plugin can also include a black- and/or a whitelist. With these lists you are able to write own blocking or annihilation rules to extend or overwrite the rules of the script.
Please extract the archive first. In there is a readme.txt with installation instruction, a JPG-picture with the parameters of the plugin and two templates for the black- and the whitelist.
As someone said, everything is in German. IDK about that person, but my browser automatically translates for me. Personally, I am happy to get a tiny taste of the experience 90% of web users have, which is reading strangely translated text from the Internet. It certainly does me no harm.
At any rate, presuming you can find a way around the language barrier (in my case, with automatic tools), their forum is well organized. Their bot installs without a hitch. I haven't yet received my access info (this is the patience issue, I just started this a few minutes ago and wouldn't be surprised if it takes a whole day to get that-- they are volunteers, with jobs, etc.) but I am pretty sure that it will be smooth sailing. This is clear from the quality of their work that I have seen so far.