Always start by clicking "Read" to download the current "Codeplug" from your radio to your PC. This creates a backup.
In 2024-2025, the best "free" software experience actually relies on a $20-$30 USB cable. Look for a "Motorola Professional Series USB Programming Cable" that includes a built-in FTDI chip (clones work poorly). This cable acts as a virtual RIB. motorola gm338 programming software free best
Run the installer as an administrator.