You can go through the following post--
communities.bentley.com/.../7406.trialvalid-license-was-not-found-message-still-appears-even-when-licenses-are-available
If the problem still exists, as suggested by Biswa, raise a service request.
communities.bentley.com/.../7406.trialvalid-license-was-not-found-message-still-appears-even-when-licenses-are-available
If the problem still exists, as suggested by Biswa, raise a service request.