Please follow the below steps:
1. Quit Lightroom
2. Check Adobe's entries under host file:
Location for Host File:
Go to finder>click on Go> type /etc
Under the etc folder you would have the host file.
If you do have some entries :
3. Restart Lightroom and check whether its still on trial or not.
If that that doesn't help please click on license the software on the same dialog box where its says 1 day left for trial.
Please let us know if it helps