Those are not allowed by the license agreements. Irrespective of whether or not the key will actually work, if you use the upgrade version then ethically you're not allowed to use the previous version any more. And if the old, broken computer has an OEM key then you're not allowed to transfer it to a different computer.
Those are not allowed by the license agreements. Irrespective of whether or not the key will actually work, if you use the upgrade version then ethically you're not allowed to use the previous version any more. And if the old, broken computer has an OEM key then you're not allowed to transfer it to a different computer.