new to this and need help

My Satellite Setup
mediastar Hi Tech
My Location
Hi to all

I just bought a receiver from Dubai (mediastar Hi Tech free to air) this receiver has been already program to see most of the channel with hotbird (multivision, tps, xxl...) I have tried from there and working fine.

Now i a back to europe and the guy told me i will need to download a sofware when code will change via the connection RS232c from the receiver to my computer.
How can i connect this cable to my computer (and where exactly) on a way to download the latest software..
Sorry if my question sounds stupid :-doh! but ure help is highly appreciate..
thank you