ADF Blitzer will write adf images to an Amiga disk once you get the files over to the Amiga. To get them there you can use Cross DOS or FAT95 (on the disk I sent you) to read a 720k floppy disk from the PC.
Note: To format a medium density disk to be readable if written by a high-density PC floppy drive, you may have to run the disk under a magnet to erase it completely. A true medium density drive, such as the one that your A2000 came with, has a wider head than a high-density drive and may get confused if there is old data written along the edges of some of the tracks. The correct way to format a 720k floppy on the PC is to pop up the Windows command prompt and type "format a: /t:80 /n:9" without the quotes.