usb-audio.com (ploytec) driver works under 64bit Windows7/8/10 with original Mbox. I have not tested it with FL but it seems it works with all ASIO apps except PT12.
If you can live with Round Trip Latency above 20ms at lowest workable 128 buffer (called "fast" in that driver) you can still use it. You can even use it as standalone mic pre. Still ain't bad IMO. Sentenced to RIP too early