The Wikipedia entry explicitly classifies Freemake Audio Converter under the license type "Trialware (Ad-supported and crippleware)". In other words, the free version has a significant functional limitation, regardless of whether you have a key or activation code.
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While primarily for video, HandBrake is an excellent open-source tool for extracting and converting high-quality audio tracks. How to Get Freemake Safely This link or copies made by others cannot be deleted
is a comprehensive multimedia framework that can handle nearly any audio or video conversion task: Try again later
For those unfamiliar with what Freemake Audio Converter can do, the feature list is genuinely impressive:
Whether you need or advanced audio editing capabilities ?