Downloading WiNRADiO G305 2.20 from the developer's website was possible when we last checked. We cannot confirm if there is a free download of this software available. The software belongs to Multimedia Tools. The most popular versions among WiNRADiO G305 users are 2.2 and 2.1. WRg305.exe is the most common filename for this program's installer. We recommend checking the downloaded files with any free antivirus. The actual developer of the software is WiNRADiO Communications.
From the developer:
G305 demodulators are DSP software plug-ins which fit into the G305 control panel. All the last IF (intermediate frequency stage) and the demodulation stage functions are performed in software. Having been freed from hardware constraints, this brings about unprecedented level of flexibility and performance to the receiver.
You may want to check out more software, such as WiNRADiO Virtual Sound Card, WiNRADiO G313 or WiNRADiO G303, which might be similar to WiNRADiO G305.