Easier said than done these days, ever tried finding a pc/laptop with a serial port? As it happens I've just updated a Spider this way, I resurrected a 15-year old NEC Packard Bell (remember them?), serves as a good reminder of easy things have become these days. I believe it can be done with a USB~serial cable too.. I have one of those too but it was the wrong gender for the box, so if you are rushing out to buy one make sure it's correct or get a gender-changer too.
Good luck!