Hi Kari,
Which version of SQL Express are you running?
It looks like you're upgrading from 2.9.0.3. The script trying to run is to upgrade to 2.9.04 and it is trying to run several DROP .... IF EXISTS statements. That feature was added in SQL Server 2016, so if you're on an older version than 2016, you'll need to edit the/Setup/applications/mojoportal-core/SchemaUpgradeScripts/mssql/2.9.0.4.config file to remove the IF EXISTS from each line. Once you do that, you can re-run setup and it should get you to the next upgrade script at least.
I recommend upgrading to a newer version of SQL Server because we don't target or test for 2016 anymore.
Thanks,
Joe