I just upgraded Trial to amember pro, there are 2 license files in my member area "Licenses" drawer. One uses my domain name and say it expires in 4 months, the other under the name "localhost" and expires in 2099. I used the "localhost" license since I figured a 2099 expiration was what I would have, but my admin panel barfed it as a "non-match". So I copied in the 4 month license that uses my domain name and my admin panel is happy with that. Can't find any documentation.... Am I supposed to renew my license in 4 months? Will a fresh license be automatically sent to me in 4 months? Or am I supposed to alter/fix that 2099 expiring "localhost" license? I just don't want to wake up to a surprise in August with a dead site, and start searching for documentation again suddenly.
localhost is just for testing on your local dev / sandbox that is configured to use 127.0.0.1/localhost. The license for your domain is limited to 4 months to allow you to test the system to ensure it meets your expectations before a permanent license is issued.