The safest bet is always the manufacturer’s "Support" or "Software" page. Look for the "RT15" model under the portable radio section.
With the software installed, you are ready to program. Here is a workflow for first-time users. Rt15-cps Software Download
For many, downloading this driver is their first foray into "hardware hacking." It requires navigating COM port settings, installing specific USB-to-Serial drivers (often the Prolific or CH340 variety), and ensuring the software version matches the radio's firmware. It is a rite of passage that teaches the basics of how wireless communication actually functions. Efficiency and Safety The safest bet is always the manufacturer’s "Support"