rtAudioVideoPlugin_x86_64

This is a system-level internet plug-in component, not a standalone application, so it cannot be updated independently through the Mac App Store or a separate vendor download. Internet plug-ins on macOS are managed by the operating system itself and are updated as part of macOS system updates. Since this plug-in is named as part of macOS Internet Plug-Ins, updating your Mac to the latest macOS version available for your machine will automatically provide any necessary updates, including native Apple Silicon builds if your Mac supports them. Open System Settings → General → Software Update and install the latest macOS your Mac supports. If you are on an Intel Mac, your system will continue to run Intel plug-ins; if you are on an Apple Silicon Mac, ensure you are running a current macOS version to get native builds of all system components. The vendor Rtaudiovideopluginlib does not appear to maintain a public download or installer for this component — it is wholly integrated into macOS.