If you are upgrading from Version 4 to Version 5 you will need a new license key from Crossware.
Please contact our support team at firstname.lastname@example.org for a new license key.
We will need the Company name that bought the Crossware Mail Signature license together with a contact name and email address.
When you install the new Crossware Mail Signature V5 you need to add your new V5 license key alongside your V4 key.
If you need to upgrade more than one server, please see upgrading multiple servers for further information.