2010 94-171 Redistricting Data Summary Files

I need to get small area data on children by race/ethnicity. Ideally I'd like to get the number of children in a zip code by race/ethnicity for any year 2010 or later. I'm having trouble finding data like this on data.census.gov. Alternatively, I could also use the 94-171 Redistricting Data Summary Files PL2 & PL4 at the block group level but I can't figure out how to access them. With the transition from Factfinder to data.census.gov it's become difficult to get information on children by race at a small geography.

Any help anyone could give me on finding this data would be appreciated.