I am new here and maybe missed something about searching and downloading.

First download was from an "m4a" type source at a bitrate of 320. Turned out to be music files in an AAC Audio format, unreadable by any of my players (and not something any of my various sound editing applications can convert.

Should I just not be downloading from "m4a" sources or at that high a bitrate to avoid this problem?

Or is there a freeware that can convert .aac files to WAV or MP3?

TIA