OK. I've had pretty decent luck figuring out the newsgroups thing, thanks to a few wonderful OT.com members and some tutorials, but I'm having no luck with this problem. I grabbed the 97 ANH SE DL, and when I tried to unpack it, I got the following errors:
! F:\newsgroups\a.b.starwars\sw anh se dl\SWarsIV_SE_DLayer_Flunk.part084.rar: Packed data CRC failed in SWarsIV_SE_DLayer_Flunk.img. The volume is corrupt
! F:\newsgroups\a.b.starwars\sw anh se dl\SWarsIV_SE_DLayer_Flunk.part086.rar: Packed data CRC failed in SWarsIV_SE_DLayer_Flunk.img. The volume is corrupt
! F:\newsgroups\a.b.starwars\sw anh se dl\SWarsIV_SE_DLayer_Flunk.part138.rar: Packed data CRC failed in SWarsIV_SE_DLayer_Flunk.img. The volume is corrupt
! F:\newsgroups\a.b.starwars\sw anh se dl\SWarsIV_SE_DLayer_Flunk.part143.rar: CRC failed in SWarsIV_SE_DLayer_Flunk.img. The file is corrupt

I've tried grabbing what I thought were the right headers to rebuild this, but have had no luck. Can someone please help a newsgroup-challenged padawan?