There's another installer at sourceforge.net/projects/phptriad. Since releasing it, about 15,000 people have downloaded it and I've had less than 15 people reporting critical problems. Of course there may be a large, silent, suffering group of users out there who just complained to someone else, but it appears to work for most folks.
Disclaimer: Yes, I wrote the thing. No, I don't make any money on it. Actually, if I had to pay for the bandwidth of 15,000 downloads of 9MB a piece, I'd be toast.