Sabre415

As a newbie I am looking forward to learning as much as I can and would like to ask the forum for some advice. I have a Skywatcher Synscan controller and read it should be updated. I tried reading the manual (online) to see how I do this and also looked at YouTube clips. The trouble I’ve discovered is you need to be a computer wizard to understand cables/ transfers/ data etc. I don’t have a RS232 communication port on my laptop, but do have USB slots. The manual at this point lost me and I would have probably blown the house up trying to carry on 😣 So I’ve looked at the bottom of the handset and the side of the laptop and looked on Amazon, to which I found this item: D1-DNTO7A D1 DNTO8A Mega - Fabs D1 Servo Driver cable FTD1 USB RS232 to RJ11 RJ12 6P6C Adapter. (Sorry for the long description) I will be grateful for any advice and steerage to what would work please Thanks