Your iRacing Live Timing, Live HUD & Live Streamer app license is tied to your iRacing account. When you placed your order you entered your iRacing Customer ID. If you entered this incorrectly or are connected to iRacing with a different iRacing account then the software will not authenticate.
If you are trying to view a replay from a different iRacing member then our software will not authenticate unless they also have a license. We provide a workaround for this; first ensure iRacing Live Timing is running, open a live iRacing session and ensure iRacing Live Timing successfully connects. Then keep iRacing Live Timing open, close your live session and open your replay file.
If you need further assistance please ask in our Discord Support Server.