When you buy your VAGCOM-VCDS from Ross-Tech, you get tech support.
You can also download the program to any compatible computer you have. The CABLE is the key to everything.
I just got a little laptop, Dell 3180 refurb, from Tiger Direct with WIN 10 pro on it. It was less than $200. ($170+ tax and shipping) I got it for use with the VCDS exclusively when I found my old Dell 5100 with MS-XP wouldn't handle the new release 22.9 properly.
You can do all sorts of "adjustments" to the ecu with the VCDS too, changing the IQ if you change injectors is one of those.
PS. I don't work for Ross.