rsync for 4.1 iso?

[Keith Silman]

After Charlie's suggestion to use rsync to update iso I succeeded in
updating rc4 to rc5 but cannot update rc5 to release version.  has rsync
been enabled or is my syntax wrong (probably :{ )?
my syntax is:
rsync // ftp.e-smith.net/pub/e-smith/e-smith-4.1/iso/e-smith-4.1.iso
/tmp/e-smith-4.1.iso .
/tmp/e-smith-4.1.iso is my local iso
can someone check it for accuracy please?
TIA