Back up all databases that will be updated to the new version. If you subscribe to DonorWorks SAAS or Data Hosting you can contact support to make a backup or simply rely on the nightly backup.
Click the link above to download the installer for your platform.
Run the installer you downloaded and follow the on-screen instructions. This will remove previous versions of DonorWorks from your computer.
Open DonorWorks and update your database(s) to the current version.