Activation is usually accomplished automatically and within seconds via the internet.

Sometimes that process does not work as intended. The main problems activating a license are:

Your device is not allowed access to the internet or the internet is down. In this case, you need to manually activate ExtendSim. Please see Installing & Activating an ExtendSim 10 Individual License.

Bad HTTP transaction. Error: License Generator not found at this URL. Please try again.Your device has an internet connection, but you get an error message indicating that activation cannot be completed. This is usually caused by a virus protection application or a firewall blocking activation. You can either manually activate ExtendSim or temporarily turn off the virus protection to allow ExtendSim to communicate through your firewall.

To temporarily turn off virus protection on your computer to allow ExtendSim through the firewall, go to Settings > Update & Security > Windows Security (on left hand side). Under Protection Areas, select "Firewall & Network Protection" and "Allow an app through the firewall". Then click the "Change Settings" and "Allow another app" buttons. Browse to ExtendSim 10 and click Open. In the dialog that appears, click Add. Then try activating again.