Q++ is licensed on a yearly basis. This message appears when the current yearly license has expired. Q++Studio will need an updated license file to continue to function.
If you believe that this message is incorrect, you should contact technical support immediately. If this message is correct and you plan on renewing your license, then you should contact sales to arrange for the renewal and payment of the license as soon as possible. Once you have renewed your license, follow the instructions contained in the Updating your License topic.
Important : Do not try to install any of the newer updates that are available on the web, as these will not function at all (ie you will not even be able to launch Q++Studio).