Get the most recent GPU-BH tree code for FLASH4 at the FLASH Homepage:
FLASH-CENTER or direct download: Flash4_GPU_BH_Installer.diff


Unpack the archive and run the script. The script needs a valid FLASH4 path to copy the GPU-BH tree source code into the correct directory.

Beside the actual gravity module, an example setup is copied into the SimulationsMain directory.