Then you're doing it wrong. :-)
It's been a Looooong time since this became an option but
DLVRYFMT(*IMAGE) tells SNDPTFORD to download an image catalog instead of individual *SAVFs. Safe to say at LEAST i 7.1 had this option. You then get to specify:
Image option . . . *DOWNLOAD or *ORDER(use WRKPTFORD to download) Image directory .
Image prefix . . .
Image catalog . .