LINQPad: Unable to contact licensing server

Good news for those who get Unable to contact licensing server while activating LINQPad or are on some private network with no public internet access - there is a way to activate it 'offline'.

1. Try to activate program - wait for error message.
   Now LINQPad has put an extended activation code into your clipboard.
2. Go to LINQPad offline activation page and generate offline activation code.
3. Go to activation window in LINQPad
   
   
4. Right click on "Activation requires Internet connectivity."
   
5. You will get "Offline activation" window
   
6. Paste your offline activation code, click "Activate"
7. And you are done!