After installing and licensing Scan Engine 5.x, you attempt to run LiveUpdate Content. Instead of completing, the LiveUpdate Status for the Av Definitions changes to "Unable to Update". You seek steps for troubleshooting this symptom.
Clear browser cache
Check license status in the Scan Engine interface
Attempt to download livetri.zip using a web browser
Check liveupdt.log file for errors
If all else fails, uninstall and reinstall Scan Engine