Since TotalMedia 3.5 was designed for older versions of Windows (Vista/7) and lacks support for modern features like 4K or current EPG data, most users switch to free, modern software that does not require a license key:

TotalMedia 3.5 alternative for DTV capture - Windows 10 Forums

A robust, free media center application designed specifically for watching and recording live television on Windows, Linux, and Mac.

Windows users wanting an open-source Media Center clone.