how to copy archived voicemails to computer from Galaxy S5?

I have been archiving my voicemails when my voicemail inbox gets full. I want to save them for legal reasons. Now my archive box has maxed out (500 messages). How can I find those files on my phone so I can copy them to my computer, and delete them from my phone so I can receive voicemails again?

If the voicemail is maxed out, that's the carrier's voicemail system that's holding your voicemails. Call them and ask how you can create - or receive - printed copies of voicemails. Each carrier uses a different system.