Even with a stand alone license, PTC products need to communicate with the license server and the authorization codes are tied to the NIC. A lot of laptops have two NIC's, on wired and one wireless. Windows will reorder these cards when you plug/unplug a wired connection or connect to a wireless hotspot. There is a way to edit the registry to fix the order of the cards so Windows doesn't pull the rug out from under you.
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The Help for this program was created in Windows Help format, which depends on a feature that isn't included in this version of Windows.