I get a “No valid license” error message, even though I have a valid license key. What should I do?

First, it would be important to verify your connection to the license server. You can do this by opening the License Manager. Once opened, go to the "License server configuration" section and click the "Test" button.
Here's how:

If pressing the Test button shows “Connection failed” this will be shown:

What could cause this?: 

• There may be a network issue in the background, so the program cannot reach the required server. This usually happens when an antivirus or firewall does not allow communication with the server. Try modifying the firewall or antivirus settings on the computer.
• You should also check your VPN connection to verify whether is blocking it.

If you need further assistance please open a ticket on our Support Portal or send an email to support@chemaxon.com. Please attach a license report to the ticket or to the email. You can find more details on how to generate one here.