First, you need to have a floppy disk drive, that is, a drive with the drive letter A: or B:. Then you can run HD-Copy. Then press the arrow keys on the keyboard to select Get from file, and then enter the storage location of the IMG file. For example, mine is in C:\DOS_1.img, then press Enter, as shown in the figure:
Then press the arrow keys on the keyboard to select Write. If there are files on the floppy disk, you also need to press Y once to confirm deleting all files on the floppy disk. When all the green Vs flash, the content of DOS_1.img has been written to the floppy disk. To write the next file, select Get from file, then enter DOS_2.img, press Enter, then change to an empty floppy disk, and then select Write.