Hello,
For debugging purpose, could you try to connect to this page:
http://licensing.arction.com/testconnection/If you see text ‘Connection OK’, then there are two possibilities. One is antivirus software is blocking license module running (check corresponding event log). Another possibility is connection being too slow for license activation.
The workaround for the 1st problem (reported for Norton Security or Webroot SecureAnywhere) is temporal disabling of auto-protection of Antivirus software. That is, disable AV, remove (not activated) license from License Manager and then try installing license again.
The workaround for the 2nd problem (as well as more general solution for 1st) is to use manual (via email) activation option in Arction's LicenseManager.
P.S. The license protection modules and Antivirus software problem is not limited to LightningChart: many developers are facing it. However, we understand frustration of users, and yes we are working to on it to make user experience as smooth as possible.