Is MINT App compatible with any version of Splunk?
No - you need to make sure you are updated to Splunk 6.3 before setting up MINT App or MINT App Trial.
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The requirements for the Splunk MINT App now include Splunk Enterprise 6.3.0 or later AND The Splunk MINT Add-on.
With the release of Free MINT, there are no longer any MINT App Trials. See http://docs.splunk.com/Documentation/MintApp/2.2.0/UserGuide/Requirements for all requirements.