I'm quite sure it wouldn't work, also if you're VAC banned there would be no point in downloading the DLC, you wouldn't be able to play it.
I saw on piratebay that the PC DLC is there but it says that its only for cracked version(which is discontinued) and I saw on another post on MPGH for BO1 a guy said you could do it on steam but you would be VACed instantly. Im already VACed so I was wondering if the DLC would work ofline since im VACed
I'm quite sure it wouldn't work, also if you're VAC banned there would be no point in downloading the DLC, you wouldn't be able to play it.
DLC downloaded works on redacted