The bonus of using the signature installer app is that it features auto-update functionality and will automatically update your signature in your email client whenever changes are made to it via Email Signature Rescue, preventing the need to re-install. You should use our signature installer app as it makes the installation process simple and prevents user error during install. If you're an Email Signature Rescue member, you will have a signature key and a HTML email signature file.
Signature Installer App for macOS (Recommended) Which installation option should I choose?