Hi, same for me, the only Image, i can download, is for my iPadmini4,4 only.
All other Links there gives me a 243 Byte-ipsw-File, that isnt working...
Had upgrade via OTA this Time....
Same issue with iPhone 6plus and A1457 seeds
I have tried to report this to Developer Support, but they just responds with a link to Apple support. Which of course is to no use for this type of issues.
I live in northern Europe. Since some developers report that the images are available in some areas in the US, I'm starting to suspect the errors I see is related to issues with cache servers in Europe.