Brian,
I have installed it many times on 5.5u6 installs but never had I had those errors, but I have never seen those errors. Then again I do not really pay much attention to the installation process, it takes a while on older hardware, I usually go and do something and come back and it's done

.
If you are worried, then un-install and try reinstalling it and see if you get the same errors maybe, but if it works, then I guess it works?
Cyrus Bharda