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Mac App Store (MAS) purchases use this rule "You may auto-download Eligible Content or download previously-purchased Eligible Content from an Account on up to 10 Associated Devices, provided no more than 5 are iTunes-authorized computers." so essentially every purchase is a family license, albeit a bit more cumbersome to manage because you need to align MAS account logins. There is no ability to upgrade a license or get credit for one purchased directly from Omni. At this point you can either pay the $80 again (Omni gets something like 60% of that) buy buying from the MAS or pay Omni the $40 directly for the upgrade.