You just need to send a mail and I add localhost to your license in no time (as I already did for you). It's not enabled by default because it can have different names on different setups, although localhost is most common.
If few hours of waiting time is unacceptable then you can always download a free trial for localhost which you receive immediately and it's valid for 5 days. In the meantime you will surely got a response to your request to add it to your license and you just switch the key file.