- Download the ClamXav disk image.
- Drag ClamXav.app from the disk image into your Applications folder
- Eject the ClamXav disk image
- Double click ClamXav.app
At this point, you may be prompted to install or update the anti-virus scanning engine. If so, click "Install" and follow the onscreen instructions. Once the installer has finished, you may need to double click ClamXav.app again.
If you get ClamXav from the App Store, you should use the App Store to stay up-to-date.
If you downloaded ClamXav through this website, launch it and go to the ClamXav menu, then select "Check for ClamXav Updates…" and follow the prompts.