i got the same problem just two days ago
unfortunately,i had NO WIFI,3.5G.
so i stared to search on some Forums for it.
here's the thread that the first posted
yeah i had no internet conection,so the solutions in it were totally not working!
i got a perfect one for those are in the same situation with me:
in your computer,go to Launcher Pro's website:
download the latest version 0.8.2
(which they said that they had remove the expiration)
then just store in your sdcard
take out your phone,just stay what you have,a browser yeah?
(where you put the .apk file and its name)
"is the post important thing.it'll fail if you didn't write it )
for example,i donloaded it without rename it.
and i just put it directly in the sdcard.
(where i put in my computer)
then the thing i wrote in my android browser: