I hope you got some customer service in the background on this.
I'm interested in one of these ever since my AverMedia AverTV Volar Hybrid Q konked out as soon as the 22H2 update to windows 11 kicked in; hence why I'm reading about troubles re win11 compatibility.
That said I got the AverTV 2nd hand in 2020 for $25; since it broke down I've tried everything but also learned it's a 10 year old product, and drivers/software are 5 years old.