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Ok. There is a serial shell on the DVR, where you can see the live logs and send commands directly to the system. To connect a computer to the DVR you would need to solder three wires onto the board and connect them to an USB-UART. The USB-UART will then give you a serial interface to which you can connect using any terminal programm (e.g putty).
An USB-UART is something like this..
If you are able (and willing) to do the soldering, I can send you a picture of where to solder the wires.