I have an Eye tv 500 (Firewire) running on an Late-2012 iMac i7 (Catalina 10.15.7 (19H524)) using Apple's Thunderbolt to Firewire dongle adapter. I bought Eye tv 4 in September and it hasn't worked once. Every launch gets into the setup sequence and immediately crashes. (Always thread 24 or 25 with the same, identical SEGV.)
I have contacted GeniaTech about this numerous times over the last seven months and never once gotten a reply. I have included crash logs from the Console app, system configuration data from System Profiler, steps to reproduce, contact information, .. everything I can think of to make a good bug report. I get an automated response that my bug report was received, and then, nothing.
The greatest insult is that they also have not refunded my purchase to my credit card.
I find it hard to describe this. In forty-five years of computing, I cannot recall ever paying for something that simply never worked at all. And only rarely do I recall having Customer Support turn theirback on me and ignore a crash report.