I am not sure what that means “as loose files”. You either have a full voice pack or you don’t ?
Full voice packs can be downloaded from:
Download your choice of language and variation here:
Also, a large variety of FREE in-universe character Voice packs available here:
One important file that you need in your common folder is:
voicepack.ini
without it, it is not a voice pack. and it should probably have voice_pack_version=2 in it.