The problem with Raspad 3 is its was built to run on a 32bit distro. See Install the Raspberry Pi OS — SunFounder RasPad 3 documentation. When I installed a 64 bit distro, several problems occurred and I reverted back to a 32bit os and then I was able install Raspad's functions/software.
Raspad is a good concept but lacks support/functions for 64bit.