No sound

When I record from the radio with Audacity 2.1.3 + conversion to MP3 with Lame + export, everything seems to be OK, but when I want to play it, I have no sound. I installed FLV-Mediaplayer and also have Windows Mediaplayer. What can I do? Before Windows 10, everything did it well.

Does it play in Audacity before you export?

If no… Are you seeing the Audacity meters move, and are you getting a blue waveform? How is the radio connected to the computer?

If you are able to play back in Audacity, try saving a WAV file.