AirServer is an AirPlay, Google Cast and Miracast receiver. This means you need to install AirServer on the device you intend to screen mirror to.

Examples:

• If you want to mirror your iPhone to your Mac, you need to install AirServer on your Mac.
• If you want to mirror your Android tablet to your Xbox One, you need to install AirServer on your Xbox One.

If you don't know how many licenses you need, you can find an explanation on this in a dedicated support article.