The "shotgun" approach here on MNN won't get you a better answer than just posting once on the most appropriate category's page. Sorry, my suggestion doesn't work for you, and I see a Moderator gave the same answer on one of the other pages. I don't understand an installer, even downloaded, that doesn't supply the extensions it needs!
If you want more opinions than offered here, try other forums, like MacFixit or noWonder. (Just add the ".com")
[This message has been edited by Gregg (edited 01-02-2000).]