Hello Vdinuu,
As a rule, all license keys are valid from 11.52 on with the latest products, however since you hav a special key with no expiration then you should probably open a case with your Microfocus support team for acquiring a new license key as lately we are seeing issues applying the non-expiring keys to upgraded products. A new key should be generated for you without issue as it is part of the support contract inclusion. If you are no longer under a support contract then that may be why the key is being marked as invalid. Your Microfocus support team should be able to assist with your issue.

Hope this helps,
Dan