I would think you can sell a copy of the software but if it somehow doesn't work on the buyer's computer, that's too bad. Surely the law won't require software

I would think you can sell a copy of the software but if it somehow doesn't work on the buyer's computer, that's too bad. Surely the law won't require software vendors to provide ongoing support to all future owners. Maybe you'd have to sell your whole computer and software together for it to keep working. Like if you buy an iPad with your name engraved on it, then when you sell it, the buyer will be stuck with your name still on it - Apple isn't obliged to re-engrave it with the new owner's name.