The installation problem is a misfeature in OS X, the default logon canot copy files to the System/Library folder. You have to create an administrator or root account. An easier workaround is to boot from the OS 9.1 CD that came with OS X and copy the file from OS 9.
A tech note for this is at http://www.info.apple.com/kbnum/n106237. I assume this is the URL you meant?
tell application "Finder" to select startup disk