The "USB Floppy Manager" was never a commercial product. It was a passion project—a kernel-level driver and accompanying GUI tool, likely written by a German or Japanese engineer in the early 2010s. Version 1.40i represents the final, mature build of that effort. The 'i' in the version number is rumored to stand for "integrated" or perhaps "isochronous," referring to its ability to handle variable rotation speeds.
What made v1.40i exclusive—and legendary—was its feature set: usb floppy manager v1 40i download exclusive
Forget the right-click format menu. The Format Factory in v1.40i allows you to force-format non-standard media: The "USB Floppy Manager" was never a commercial product
For an MS-DOS boot disk: