I received a How do I update OWA? question on my Anet Computers YouTube channel. First, these instructions are for updating Open Web Analytics version 1.3.0 or later. First, you want to backup your WordPress database, if you installed Open Web Analytics in a WordPress plugins folder or backup your Open Web Analytics database, if you installed it standalone, in a directory outside of WordPress.
If you installed this free website analytics software stand alone, then delete your /path/to/owa/owa-data/caches directory. Download latest Open Web Analytics software version tarball in either ZIP or TAR format. Unpack this tarball and replace your current Open Web Anaylitcs files with these new ones.
If prompted, you want to over write all files. Check to see if any database updates are required by opening a web browser and navigating to your Open Web Analytics dashboard at http://yourdomain/path/to/owa. If any database updates are required, Open Web Analytics will prompt you to apply those updates via a WordPress dashboard in your web browser or tell you to run an update command using Open Web Analytics command line interface.
Are you using Open Web Analytics version 1.2.0 or earlier? Check out these instructions on how to update Open Web Analytics for version 1.2.0 or earlier.