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just load SCP, SHTUP-ND and 400 into the mod manager, activate them, and extract the extra SCP archive into the AccFam folder. the removed content archive contains stuff that was either buggy or had conflicts, and shouldn't be used unless you know exactly what you're doing. to make it short, leave it alone (personally, I'd just remove the download completely so it wouldn't be confusing people, but that's up to ACC).
but to extract it to the AccFam folder already in my DMM
This is still being updated? Nuts, I had a few suggestions that, uh... I've mostly forgotten by now. Hm.