While older setups required a bulky Radio Interface Box (RIB), modern USB-to-RJ45 cables often have the RIB functionality built directly into the cable.
This is the original, native software designed for the radio.
: While Motorola no longer officially supports this legacy software, hobbyist sites like RadioScanner.ru RadioSoftware.online host various versions for archival purposes. RADIOSOFTWARE.ONLINE step-by-step tutorial