Purina Flock Raiser can be used from hatch on. Do you have photos of the labels you saw? It would be good to read those...
I'm sorry that you lost the chick and are having troubles this year.
If you are having trouble with chicks you hatch yourself too, then make sure that the parent stock is quality, healthy birds and that they have good nutrition before you even start thinking of collecting eggs.
Troubleshoot incubation issues as well. Check out the BYC Learning Center for articles on incubation, nutrition and more.