As of right now it seems like if you have the old V2 apps installed they can still be (re)activated with your old Serif/Affinity license that is tied to an email. I was able to just do that with Designer v2. I also seem to be able to re-down them through the Apple App Store and they work fine. You do get a prompt "Would you like to keep your app linked to your Affinity Store account? This allows you to automatically stream any free or purchased content you have directly to your app." But its unclear to me what that means at the moment given that Canva has changed the licensing model.