Download Converter.exe here and run.
usage: Converter.exe in.amr out.mp3 [sample_rate]
in.amr : Bitstream input to decoder
out.mp3 : Speech output from decoder
[Hz] : Sampling rate of output signal in Hz; default: 24000git clone https://github.com/lich0821/SilkMp3Converter.gitvcpkg install mp3lame:x86-windows-static
vcpkg install mp3lame:x64-windows-staticBuild and run.