hi
yes they have DTI dataset, go to https://db.humanconnectome.org/
make a free account, in" WU-Minn HCP Data - 1200 Subjects" section choose your subject identity code and all imaging data of your chosen subject are available,
as i know,NO they don’t have cerebro-cerebellar functional connectivity, also they don’t have cerebrum surface file,the manual said it’s not valid on cerebrum to make a surface of it.