I tried that on my Bold with wifi only, and it sent me to a page that said my device does not meet the reqiurements. The only thing I can think of is I'm using the hotspot browser.
Posted from my CrackBerry at wapforums.crackberry.com
Even if you manage to install it, I don't think App World works without a BlackBerry data plan... although I could be mistaken.
Not mistaken. App World requies an active data connection to BIS to operate. Rumor has it that future plans are to allow access via WiFi, but nothing available at this time.
Also the reason why it can't be installed via the hotspot browser.