Upgrade from SolidWorks 2010 SP04 to 2011 SP05 failing via MSI
We're trying to upgrade our education install of SolidWorks 2010 to the latest version we have. I have upgraded the license server already, and have created the new administrative image per the instructions, and transferred the share to it.
None of the clients 'auto update' as I was told they would, so I have now tried doing a manual upgrade using the msi
msiexec /i "\\server\solidworks\Solidworks 2011 SP05\32bit\SolidWorks\SolidWorks.msi" SWMIGRATE="SolidWorks 2010 SP04" UPGRADEWINSTALL=1
It churns away for a while, a SolidWorks 2011 icon appears on the desktop it says its removing the old version and then after a while it decides to roll back, and warns me that a file couldn't be found to fully restore.
Can anyone give me some clues as to why this is failing and how to fix it? I really don't want to have to go around 60 computers and manually do an install!