To download suitesparse matrices found in the file suitesparse_<x>.cmake, run the commands:

cd rocSPARSE/cmake/suitesparse
mkdir build && cd build && cmake .. && make && cp ./rocsparse_mtx2csr .. && cd .. && rm -r build
cmake -DCMAKE_MATRICES_DIR=<my_matrices_directory> -P suitesparse_<x>.cmake