Odd that it won't update. Looks like your connection is ok.
You can try grabbing it from this location:
- Go to select a catalog source on the right hand side
- Select online source
- Overwrite the source with this downloads.dell.com/.../catalog.cab
re-adding below surrounded by zzzz since the forum software converts links.
zzzzftp://downloads.dell.com/catalog/catalog.cabzzzz
Rob