Vcds Hex-V2 from Conrad

Hello everyone, sometimes an understanding question…. If I buy a Hex-V2 adapter at Conrad with 3Vin limit currently 279€ and would like to upgrade to unlimited Vin then if I have to turn to it??? I looked at ross-tech and there costs an upgrade 169US$ so about 144 euro! If I buy the same at Pci costs the interface 279€ and the upgrade from 3 to unlimited even 329 euro? Thank you!