i want to download windows 3.1 it must be in .IMG format to dd to a usb card in linux for my pc.
i want to run old software.

I think it is still illegal to download Windows 3.1 for free and I doubt anyone still sells something that old. so, in my opinion, best thing to do is to contact Microsoft. May be somehow you can buy it directly from Microsoft, it shouldn't be expensive!

Do you have an MSDN subscription?
You can probably get it for free that way.

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