Editing m4a files

Hi Audacity friends. I have been trying to open a .m4a file to edit, and tried downloading stuff to get it to work but so far no good. Any ideas?
I downloades Lame and installed it.

LAME was previously required by Audacity for exporting in MP3 format. It no longer needs to be installed as it is now included in Audacity 2.3.3.
If you have an older version of Audacity, you can get the current version via the Audacity website: https://www.audacityteam.org/download/windows/

You may be able to import the audio from M4A files if you install FFmpeg. See: https://manual.audacityteam.org/man/installing_and_updating_audacity_on_windows.html#winff