upgrade from 2.8 to 2.9

i have a friend who has 2.8.23 and has a level 5 license.
his upgrade license is set to expire on February of 2007

I inserted a 2.9 cd and dragged the .npk files from the cd into the files box however it didnt allow the files to be upgraded

Can his 2.8 be upgraded?

thanks

use ftp please! follow the manual
http://wiki.mikrotik.com/wiki/Upgrading_RouterOS