You need to request the extension of the trial once the new Remote is available. They said it clearly that you need to reply to the email announcing the availability of the new Remote and request 15 days trial extension.
If your trial already ended, this is a problem of course. You have the choice to either subscribe if you’re already convinced, ask for trial extension by writing to support@audirvana.com and/or use the old version until the new remote is released and then request the promised 15 days extension to try the remote.