Does anyone know where and how to get the octgn images for the cards for warhammer 40k

You are so asking that in the wrong place bud XD

You can probably find a censored image pack somewhere (as this is what FFG have requested people do, as trying to stop people playing on OCTGN is a can of worms I don't think they want to open). I don't have a link myself though.

If memory serves, OCTGN image packs typically are published a few months (six?) after the physical cards are released (less, if you can find someone who doesn't care, but those links are often hidden away on the internet somewhere rather than in the OCTGN client).