Hi,

You can use one of the initializer constructors of NLicense that accepts an array of keys:

List<NLicenseKey> keys = new List<NLicenseKey>();
keys.Add(new NLicenseKey("licenseKey1"));
keys.Add(new NLicenseKey("licenseKey2"));
NLicense license = new NLicense(keys);
NLicenseManager.Instance.SetLicense(license);
NLicenseManager.Instance.LockLicense = true;

Let me know if you meet any problems.