Sorry to hear you are having trouble activating your license. This is an error being by WordPress. Basically, WP is telling Connections is is not able to connect. Generally this is caused by the web host. But most often this is encountered only on local installation of WP where the firewall is blocking access.
Are installing on a local install or on a web hosted account? If it is a web hosted account, can you install plugins from the plugins directory?
Let me know what your learn.
ps. Not being able to activate the license will not prevent the Widget Pack from functioning.