Music Tag requires an internet connection to be able to download track information or artwork for you. Please check that Music Tag is connected to the internet - there should be an "Online" indication in the bottom right corner of the app.
If Music Tag appears to be offline, please make sure that the software has correct permissions to run and that it's not being blocked by your firewall settings as detailed in our guide below...
Music Tag is not connecting to the internet - Troubleshooting