Use link (m.vk.com) the mobile version from the site

I tested and using right now this workround method and indeed it's working, thanks @Dzmitry

**UPDATE**

Today (30/09/20), probably ADM(s) updated the addon again and even if the link is unavailable for direct download (which leads to that error "err404.html"), SaveFrom will open a popup with a secondary downloader and convert the file on server into a link and download the audio automatically. Thanks for this update, guys!