Hi Mark,
The upgrade files are partway down the page here;
http://www.cisco.com/cgi-bin/tablebuild.pl/wlan-sol-eng
WLSE-2.15-K9.readme-V1.txt
WLSE 2.15 upgrade Readme file 2.15
WLSE-2.15u-K9.info
Information file for importing the upgrade image to the WLSE internal repository 2.15
WLSE-2.15u-K9.zip
Wireless LAN Solution Engine 1030, 1130 1130-S19 1133 patch release for upgrading from 2.13 and 2.13.1 to 2.15
Hope this helps!
Rob