Convert ZIP to WAVE

You can't convert Zipped Files directly to WAVE Audio Files (.zip to .wave conversion). Should your ZIP archive, however, contain any audio data (such as WAVE files), simply extract those file by decompressing the zipped files.

If such ZIP archive contains audio data in audio formats other than WAVE, simply use an audio editor or converter that would let you convert such files to WAVE (essentially the same as WAV) format.

Simply put, it is impossible to convert ZIP to WAVE directly.
Thus, there is no so-called zip to wave converter or a free online .zip to .wave converter to be found.