Occasionally, the license key is valid but authorized for a different version of the software (e.g., a license for ISIS v3.6 being used with ISIS v4.0). While this usually generates a specific "Version Mismatch" error, it can sometimes manifest as a generic "Cannot find" error if the Feature ID requested by the new software does not exist on the older dongle.
A: Trial licenses expire (typically 30 days). Uninstall the trial, clear the registry (Solution 6), and reinstall. If the trial period is truly over, you must purchase a student license from Labcenter or an authorized reseller. Occasionally, the license key is valid but authorized
If you are on a university lab computer or corporate network, you may have a floating license. The error "cannot find a valid license key" might actually mean it cannot find the server. Uninstall the trial, clear the registry (Solution 6),
Add the following to your Antivirus/Firewall exclusion list: The error "cannot find a valid license key"
If you have a backup of the license file or a new one provided by the vendor (CH2M Hill or relevant distributor):