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.3DM is Rhino3D extension, which means you need to buy that program/get a trial in order to stage your shots and render them - then you can save them in .jpg or any other format.
I just want to add:
1) you have a freelance 3D section here on CG Trader, you can pay someone to render the shots you need
2) if you only need those specific renders you saw on the product page, contact the seller, i'm sure he will be happy to send them to you.