The Shop Administration options won't show up. One more thing, my forum doesn't use the default theme. Is that the problem? I also use 1.1.5.
If you're not using a default theme you need do the necessary modifications to that themes file seeing as the mod package installer only does it to the default theme.
Go here:
http://custom.simplemachines.org/mods/index.php?mod=65On the top right select 1.1.5 from the dropdown & click submit. That will give you what the mod does to install it. Things that say
./Themes/default/xxxx.php
You need to do for your theme where it would be ./Themes/THEME NAME/xxxx.php