Download from : http://audacity.sourceforge.net/download/
Install then run Audacity
Open the directory with the M4a files you want to convert
Drag all the M4a files over to Audacity and wait for it to process each one
If you get this error message while importing then go to Edit then Preferences then libraries
Click on the download button for FFmeg Library
This will take you to : http://manual.audacityteam.org/o/man/faq_installation_and_plug_ins.html#ffdown
Click on the appropriate download page
Click on ffmpeg-win-2.2.2.exe for your system
Download and install
Once installed close Audacity(this is must) then reopen
Drag the M4a files over to Audacity and wait for it to process each one
Once complete go to Audacity and click on File then Export Multiple
Untick "Overwrite existing files" now choose the export location (must do this each time) press Export
Click OK for each file, it will then batch process them all
In Audacity press File then exit
You can now delete all the M4a files in the directory
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