If I was you, do the following:
Make a backup of your Steam BO2 Game Folder.
Then place piry.exe inside your Steam BO2 Game Folder.
Run piry.exe
It will skip downloading all the steam files since you already have them and will only download the DLC files.
Plutonium.exe can then be used to start Plutonium T6 and you should be able to load the DLC maps.
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