Use Git to get the most current version of the bot. Please use Git if you want to develop plugins, because 0.9 is outdated and will soon be replaced by 1.0.
Grab your copy with the following command:
git clone http://git.otfbot.org/otfbot.git
you need setuptools and maybe essential development tools, depending on how many requiered python modules are already installed on your system. on debian:
apt-get install python-setuptools build-essential python-dev
when setuptools is installed, just do
easy_install otfbot twistd --help #this generates the dropin.cache
If you cannot use git or do not want to use git, you can grab the latest git snapshot.
If you try to run OTFBot on Debian Etch you may need this package