Mine has an instruction sheet inside the package. It’s visible underneath the saucer section in between the layers of the plastic that holds most of the pieces into the plastic tray. Since I am not planning on assembling mine, I didn’t bother to extract the instructions from the package. I don’t know what to suggest if yours did not include an instruction sheet. Although it seems pretty straight forward to assemble it. The nacelle struts seem to be color coded from what I can tell so I would imagine it would be fairly straight forward to put together without instructions. The only thing of note I saw on the visible side of the instruction sheet was a note that once assembled, to not take it apart because pieces may break doing so.

Hope this helps,

Ryan