on the obs you will need a gm software card and the tis2000 working, there is usually a small file (key) that gets put into the tis2000 software to unlock the software
once you have that part done then you need to use the db9 to rj45 adapter and a ethernet cable, if you have trouble with communicating then you need to check the serial port settings the computer and software have to match settings, i.e. com port 4, 9600 baud, etc.
all the files you need will be in the tis2000 software already you will not need to be connected to techline at all as far as I know. I don't think there is any files or updates that you can get online everything is already in the tis2000 software including programming modules.