User blog comment:NickyLinnea/Fortune Hunter upgrade on a War Frigate/@comment-97.84.210.99-20121010224420/@comment-1140008-20121010224735

Fortune Hunter is a tier 2 upgrade. You need to Upgrade thru Tier one, on the Cargo track to access it. Your ship must be Cargo Rank 3 before you're able to Upgrade to Fortune Hunter.