Upgrade by Mail Customization

I am trying to upgrade our R5 clients to R6 using the upgrade by mail option with a custom installation. I have been following the directions in the Upgrading to Lotus Notes and Domino 6 redbook. I installed the InstallShield Tuner for Lotus Notes and setup the installation on a shared network drive, but my users get an “Error reading setup initialization file” when they try to upgrade. I have searched high and low for the problem and haven’t found any solutions. Does anyone know what may be wrong?

Subject: Upgrade by Mail Customization

RESOLVED!!! My problem was trying to create an installation launcher for Windows clients. Once I skipped this option, which the “Upgrading to Lotus Notes and Domino 6” redbook mentions using for Windows clients like it is a no-brainer, I was fine. All I had to do was create a .bat file to have the install button run in the upgrade e-mail.