When I try to download the new 11 update I keep getting a message that says " there is problemwith the Windows Installer package A program run as part of the setup did not finish as expected. "

Hello, hartadrian.

I would recommend attempting to repair the Apple Software Update via the steps below. Once processed attempt to download, update or install iTunes 11.

How to repair Software Update for Windows

http://support.apple.com/kb/TA24326

If you are still experiencing the issue, completely remove all components of iTunes in the order specified of the article below. Once this has been processed, attempt to download and install iTunes 11.

Removing and reinstalling iTunes, QuickTime, and other software components for Windows Vista or Windows 7

http://support.apple.com/kb/HT1923

If you experiencing errors when removing components of iTunes, follow the steps in the article below.

"The feature you are trying to use is on a network resource that is unavailable" alert when removing Apple software in Windows

http://support.apple.com/kb/TS3704

Cheers,

Jason H.