This totally worked. You rock BeRod.
- To fix this problem first of all download the " Package invalid issue resolver" can be found easily on the internet I can't link it here because BHW doesn't allow me I don't why.
- Second close Bluestacks and on the bottom right hand corner open the hidden icons and exit the " Bluestack agent"
- EDIT : Finally Re-open Bluestacks and open the package Invalid issue resolver app then download Instagram.