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How do I clear an expired trial license for my SSG5 to stop the error messages in the log?

exec license-key delete <key name> will take care of the old keys for you.

It is also highly recommended to remove any licenses not being used.  Loading the license pre-allocates memory required for that particular license.  For example, if you have DI license, but are not using it, remove the DI license, followed by a reboot.  Each UTM feature consumes a lot of memory.

Perform "exec license-key delete <key name>", save, and reset to free up allocated memory for this specific feature