Readme for version 2.0.3. Download
Readme for version 2.1-dev. Download
Further instructions for version 2.1-dev. Make sure to run the setup.sql script if you are not installing through the command line. Previous versions should not be in the database if you have to manually run the setup.sql script as it will throw an error when it tries to create the tables.
Topic placeholder for version 3.0. I'll update this post when version 3 is released. For now support can be placed here instead of spamming the AdKats thread.