To install DLC on a jailbroken device
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You must find the Documents folder for the app in question (whether GH or RB),
which can be done with iFunBox or a similar tool while connected to a PC, or
on-device with iFile or Filza. Simply put the files found in the GH or RB
folder in that Documents folder, named as they are. Make sure the app is
closed before you do so to prevent any issues.

-LocalH