oh so you downloaded the files from two different servers

... the names of files are not the same
try to rename the downloaded files
all the file must have the same name like this
application ios 3.x.x DVD1.part17.rar
.
.
.
application ios 3.x.x DVD1.part25.rar
hope it will work for you... i did mistake when i changed names and you did mistake when you changed the server
