Long time EyeTV user here.
I don't know about recent months, but I bought EyeTV 4 last October and got the activation key a few minutes after I received the invoice (separate emails). If you have an Geniatech store login, log in first. If not, create an account.
I only record OTA shows using iMac Retina 5K 27-inch 2017, macOS Catalina (10.15.7). I use XMLTV Listings for the EPG program data.