how do I convert an M4P (I purchased years ago) to an MP3...No, Convert won't work
how do I convert an M4P (I purchased years ago) to an MP3...No, Convert won't work for an old protected file. Thank, TG
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Convert music file formats in iTunes on PC - Apple Support
You can convert iTunes Store purchases only if they’re iTunes Plus songs.
Several years ago Apple offered a way to convert protected music files to an unprotected format for a nominal charge. But that service is no longer offered. I am afraid all you can do is repurchase the song in the iTunes Plus format (free of Digital Rights Management (DRM) limitations).