EyeTV 3.6 is discontinued, but you can find the installer on archive sites (e.g., Macintosh Repository). Be careful — only download from trustworthy sources.
Geniatech still maintains a legacy support page for EyeTV. Visit their support portal and provide: serial code 3.6 eyetv mac
The software license for (including version 3.6) is a paid product owned by Geniatech . EyeTV 3
to back up preferences, which may help support staff identify your original registration. Important Compatibility Notes EyeTV 3.6.9 on MacOS Mojave 10.14.1 - Discussions EyeTV 3.6 is discontinued
If you simply want to play old .eyetv recording files (a proprietary bundle of MPEG-2 TS data), use VLC Media Player . VLC can open the Video.eyetv file inside the .eyetv package folder.