No. The textures are packed inside the .blend, so it opens standalone on any machine. Open it, press F12, and you have the render you see in the previews.

Cycles, and only Cycles. The scene is calibrated with the AgX view transform at -1.8 EV, and it has refractive glass and one light linked to a single object. It has not been tested in Eevee, so I am not going to claim it works there.

Yes. Every piece also ships with no print at all, on plain board, film, pulp and aluminium. And the dielines and print artwork are editable SVG, generated from the same numbers as the UVs, so a flat you redraw still lines up on the model.

They are real EAN-13 symbols with valid check digits, so they scan. They are built on GS1 prefix 2, which is restricted circulation and is never assigned to a manufacturer, so they cannot correspond to anybody's product. MIRVENA is a fictional brand made for this asset.

Yes. Each piece is also included as GLB, OBJ with MTL, FBX and USDZ, plus a reduced real-time GLB set: 129,602 triangles against the 173,290 of the full resolution. Textures come as separate 2048 and 1024 px PNGs.

Ten of the twelve are. Two are not, on purpose: the brick carton's folded ears and fins are single sheets of laminate, and the biscuit carton's window is a single sheet of PET film. Giving either of them thickness would be modelling something that does not exist in the real pack. If you need them closed for 3D printing or a boolean, say so and I will help.