Yet another post about Wavelink 3 issues

Hi all, after installing a system from scratch (because the old one was damaged), I decided to go for Wave Link 3.0. At first glance, everything was okay-ish — working nicely and stuff. The only thing I haven’t tried yet is streaming and mix output switching. I’m using a separate button on my Stream Deck, which allows me to switch between my headset and speakers without making a mess by clicking around too much.

So now my old setup has stopped working because apparently, I need a brand new plugin. But after installing it, I found out that I can’t hear any sound from browser sources for some reason. I’ve tried everything — nothing works. Also, system sounds I actually CAN hear, but they don’t show up in Wave Link 3 at all. Help me out, please :'(