I'd like to convert an AAX audio file (audio book downloaded from Audible) to MP3 so I can listen to it on an older portable device, which does not support this format, nor use of apps such as the Audible App. I found online converters limited to 200 MB (whereas my file is a bit larger than that), and offline (desktop-installable) ones that I'd rather not install or that are not free.
Two such installable converters are:
- https://github.com/audiamus/AaxAudioConverter : detected as malware by VirusTotal
- https://sourceforge.net/projects/aaxtomp3/ : only converts to a 0KB MP3 file
Any recommendations how I get this done on Windows, using free software (with or without a GUI) or free online services?