This one is simple.
1) Get a 5.25" drive for your pc.
2) Download a copy of 22 disk.
3) Download any cp/m stuff you want
4) Use 22 disk to format a floppy as Osborne DD or Kaypro DD
5) Copy the files to the floppy
6) Stick the floppy in your 1571
Keep the 22-disk handy as you can transfer the other way as well.
This is how I moved boat-load of cp/m stuff to my pc about 15 years ago
when I converted to the dark side.