You could look in the ST.Database.Configuration.log that is created to see if any errors are pointed out. If possible please provide this log file to us.
It should be the console logs location for either 8.x or 9.x pointed out in this document:
Otherwise, based on your description I would suggest rebooting the system and trying again.
Dear Adam, thank's for your attention. I shared the ST.Database.Configuration.log with you.
Rebooting the system did not help. The problem is that after the rollback a second invocation of the Setup Program will not detect the previous version thus not providing the option to upgrade.
Are there any usefull command line options I can pass to the setup program ?
Is it possible to prevent the rollback after an unsuccessful upgrade ?
I'm going to try the upgrade procedure later this day again on a different machine and keep you posted.
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I took a look at the log you provided, but I'm still not certain why you would see the screen just seem to hang and behave in the way you describe.
It's possible you might be able to resolve this by restoring a backup of the database, and reinstalling the version it was previously at. Then cleanup the database based on recommendations in this document prior to attempting upgrade again: http://community.shavlik.com/docs/DOC-23430.
This guide may be helpful as well:
Other than this I would suggest making a call into support for assistance in getting this upgraded.