If your license was bought through a third party (like Kinguin) and doesn't show in the inMusic Software Center, you must contact AIR Music Tech support to have them move your old iLok license to your inMusic account.
Xpand!2 uses PACE Anti-Piracy’s iLok system for authorization. Xpand 2 Activation Code Reddit
Your vendor should have provided a specific redemption code. If your license was bought through a third