Can they be written on a Mac instead? It's easy to download the files to an old Mac with a floppy drive. For writing images to 5.25 disks I have to use the most convoluted process involving booting off an 800K disk (made on the Mac) on the IIGS that has ProDOS and Asimov, then putting in another disk with the 140K images, then having Asimov write the images. Of course because of some $4B error you can't just put the disk images straight into the 800K disk on the Mac. First you have to put them into a Stuffit 1.5.1 file and boot GS SHRINKIT and have it expand them. Then Asimov will actually work with those disk images that were expanded.
Got to:
http://adtpro.sourceforge.net/ and download the latest copy of ADTPro. With this program, and the right serial cables, you can connect your GS to your Mac and transfer the disk images to the GS which will write them to a 5.25 disk or 3.5 disk as part of the transfer program.
With ADTPro you can eliminate the hastle you seem to currently have trying to get your Apple II programs from the Mac backto the GS.
Just a thought,
Dean