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Step 1: re-download the installer from the website.
Step 2: run Disk Utility.app and repair disk permissions -- for some reason, .pkg files are not associated with installer.app, and the package is instead launching terminal.app (which lets you manage the underpinnings of the OS via a text-only interface).
Step 3: Open the new Sophos Install DMG and verify that the PKG file looks like a box. If it does, click it and install.
Step 1: re-download the installer from the website.
Step 2: run Disk Utility.app and repair disk permissions -- for some reason, .pkg files are not associated with installer.app, and the package is instead launching terminal.app (which lets you manage the underpinnings of the OS via a text-only interface).
Step 3: Open the new Sophos Install DMG and verify that the PKG file looks like a box. If it does, click it and install.