Since this week, I am getting an “licensed expired” notification but I do have a valid license.
Activate the same license again. It’s probably false negative during interrupted license check.
I have the same problem and when I try to reuse my license again I get the following error:
Failed to update the license file: unexpected end of JSON input
Most likely you have a firewall blocking the connection to our license server at duplicacy.com (which is hosted on Google App Engine).