installing from USB (again)

[altern]

hi

i asked few months ago about installing ubuntu studio from USB drive on 
  a laptop with no cd or dvd drive. My solution then was to create a 
bootable USB with the standard ubuntu version, install that and then 
upgrade to Ubuntu Studio.

I would like to install now Ubuntu Studio directly and not standard 
Ubuntu+upgrade. I cannot remember if anyone explained how to do this, i 
cannot find anything in the list archives.

any tips are welcome. thanks.

enrike