If you have a firewall, please allow connections to Examsoft.com or disable the firewall.
One product known to interfere with SofTest is AVG Internet Security. When SofTest is open for the first time, it will prompt you to register. If you have AVG Firewall Active you will see a popup like this:
"Select Allow for all networks (recommended)" and "Save my answer as a permanent rule, and do not ask me next time" as shown above and click ok.
You should now be able to register SofTest.