The MACID is used for installation. The current KPro 4 (and Hoster) do not need to go on-line over the Internet to install. The MACID is in your network/ethernet card. Whether it is attached to the Internet (via a DSL or Cable modem) or not does not matter at all as we don't go on-line.
The new security we have just finished releasing with Microstudio 2.506 fingerprints your computer with a sophisticated logic to determine if you are installing on another computer or not. The MACID is "part" of the fingerprint, where with KPro 4 and Hoster 2.014 (and prior) it was the ONLY component of the fingerprint.
The new security does require you go on-line to the MTU web site to register. However, we have provided a rather polished means to use a floppy disc to complete the registration on another computer IF the computer you are installing on is NOT connected to the Internet. Thus, you can complete the registration via any on-line computer, but the final installation still occurs on the computer you are installing on.
Click here for more details if you are interested.