I found a pretty good write up on installing the software. They didn’t sat anything about the security software but I imagine it applies.
Did you research for any other cables or is this about the best option?
well the best option seems to be a hard drive that has the software pre-installed, they run about $100 the only catch is you have to put it in a lenovo laptop, like a t22 or t23 something like that it says on the website which laptops it will work in, a used lenovo of that model runs about $100-150 (on ebay) depending on the condition, cheaper if you just buy one without a hard drive. another catch is you still have to have the usb adapter, but the software installed on the hard drive seems to be a good bang for the buck.
I only bought the vxdiag because I have all gm vehicles, I have a couple other scanners that will do run of the mill stuff for all makes/models, the vxdiag I think does other makes and models but you have to buy the software separate to unlock it.