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Windows 3.1 was originally distributed on floppy disks , meaning an "official" bootable ISO from Microsoft never existed. Because Windows 3.1 is an "operating environment" that runs on top of MS-DOS, any bootable media must first boot into DOS before launching the Windows installer. Availability & Download Sources
Do not boot it on real hardware. Use or 86Box .
You are looking for a unicorn that doesn't exist.
The best place to get original, untouched disk images is (winworldpc.com). Search for "Windows 3.1" – you will find:
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