All three apps were downloaded from the Mac App Store. Affinity Designer 2 was the first of the three that I launched. I then clicked on the "Buy Now" button and selected the Universal option. Apple Pay was triggered and I confirmed the purchase. Then nothing happened. I was returned to the original "Thanks for Downloading" screen. I then clicked on the Restore Purchase option. Nothing happened. I checked my Apple Card, the charge was pending. I waited. I received an email from Apple indicating that I Purchased the Affinity V2 Universal License through Designer 2 on my Mac (showed the mane of my Mac). I launched Designer 2 again, on the same Mac, and was prompted to "Buy Now" once again. The "Restore Purchases" still did not work.
I went to a second Mac, downloaded all three apps, launched Designer 2 on the Second Mac, the "Restore Purchases" button did not work on this Mac either. I then tried on my iPad, same thing, except this time I was prompted that no license existed (at least the iPad version tried to restore purchases). When you make a purchase on one authorized device through the Mac App Store, it should be available to download and install on another authorized device using the same Mac App Store account. Especially when the license you purchases was a universal license. The difference here is that this is an in app purchase (which is a notoriously horrible experience for such purchases I am finding out).
All this time, I did not have a serif.com account. I have only ever purchases the Affinity apps through the Mac App Store. I then created a serif.com 'forums' account, where I found this threaded discussion and made my post of my experience. I tried using the Activate button, but it prompted me for a serif.com account that I did not have. So I started a trial (thinking that there may be a working "Restore Purchases" button within the app, no such luck). Now all I see is the "Continue Trial" screen.
Per your advice, I have since created a serif.com account. When I used this account to "Activate", it tells me that "Unfortunately you Affinity account doesn't have a current valid license for Affinity Designer 2. You can check your available licenses in your account." This is likely due to the fact that I did not purchase from serif.com's online store. I made the purchase from the Mac App Store. I have the receipt from Apple for the App Sore purchase, and the transaction on my Apple Card is no longer pending, the purchase went through (my card was charged).
Again, thank you for trying to help. I tried to be a clear as I could this time (step-by-step). 🙂