What you're looking for is a License Warnings Reset Key, and if you're using a 10GB Developer license or 50GB Dev/Test license you'll need to reach out to devinfo@splunk.com - typically we are able to reply to requests for these within 2-3 business days at most.
Once you've received your Reset Key, just apply it to your Splunk Enterprise deployment like you would any other Splunk Enterprise license.
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