When converting from .m4a to .MP3, dBPoweramp fails with the following error:

Error converting to mp3 (Lame), 'G:\Yoga Nidra.m4a' to 'G:\Yoga Nidra.mp3'
Error: Unable to load decoder for file type '.m4a', codec not installed? visit 'Codec Central'. [dBCoreConverter::dBCoreConverter]

When I look at Codec Central, it says the codec is included with the program.

How can I confirm the Apple Lossless codec is installed?
Can I reinstall it?