Well, I just finished installing version 3.6.9 and discovered that it eliminated support for ATSC tuning (ATSC is the digital television standard used in the United States, Canada, South Korea, Mexico and the Dominican Republic.).
So a 64 bit version probably won't do me any good.
I suppose I could plug the eyeTV into a decade old MacBook that can't update the the new MacOS, but that would be only a temporary fix. So, I'll continue to look for other alternatives.
If Geniatech monitors this forum, would you consider giving me the source code for EyeTV version 3.6.8 (the latest ATSC version) in exchange for a percentage (to be negotiated) of the Apple Store sales that I make with a 64 bit version?