When I try to download a live wallpaper (apk and then use tAttachApkInstaller), I get an error and it will nto download. I do not have this problem on my Nexus One.
ARe you using a Droid X? Cause your info says "Nexus One". With Live wallpapers, you DL from market and then go to settings from your home screen and click live wallpapers and the one you downloaded should be in there already so you can choose.