If it already had an IPS license which expired then they cannot revert to evaluation mode. If one could do that there would be no incentive to ever pay for an actual license.
When they do the initial product configuration they simply choose "Evaluation mode" licensing. That will allow them to use the features for 90 days without a paid subscription (for IPS) or license (for URL filtering and AMP). That applies whether they are using a Firepower Management Center (FMC) server or managing locally using Firepower Device Manager (FDM).
If it already had an IPS license which expired then they cannot revert to evaluation mode. If one could do that there would be no incentive to ever pay for an actual license.
Just to add to the accurate info that Marvin said: The only license that you do not get with the 90 trial is the VPN (Strong-encryption) and AnyConnect.
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