I've been looking all day for this solution. I'm having EXACTLY the same problem as John. I downloaded yesterday LW5 and then realized it was for Leopard users. I uninstalled it with Zapper and made a search to ensure that I had no other LW files.

I have checked the receipts and the preferences. (Found nothing)
I uninstalled and then reinstalled the pkg opening it with Pacifist (as read in another forum)

I still get the same problem "nothing to install".

I'm using MacBookPro, 10.4.11, 2.2.Ghz Intel Core 2 Duo

Please help!!!

Thanks in advance,

Maria