I am suing, ermm using SIO2PC and RespeQT.
Here is how: On the Atari end, very old SIO2PC from the old DOS PC days, connected to it a converter cable that converts 15 (?) pins to DB9, connected to that a Digitus stick that converts serial to USB, connected to this a USB cable that goes into the USB port of my Windows computer. Simply works.
(I also have several newer SIO2PC-USB cables, but it looks like I am too stupid to get them working, so I am using this "simple" solution.)
PC harddisk acts as D1:, while real 1050 is setup as D2: and copying is done with Copy 2000 and a Speedy upgraded 1050 drive.