Just sharing some information for early adopters - when upgrading from SD 7.5 to SD 7.5 MP1 I recieved a big red message "The Administrator username format is incorrect, email format is required (Example:admin@symantec.com).". This occured on the page where you define the admin account for workflow before SD is installed.
It looks like the new installer now checks for this common issue which is great.
Except in my case this was an upgrade of a functioning SD 7.5 install, the installer had pre-populated the fields, had greyed the admin account name field out AND the account was in the format specified. I couldn't change the account (nor would I want to) or move past this page with this error.
My work-around was to grab the workflow installer off my SMP server (default C:\Program Files\Altiris\ServiceDesk\Web\Agent) and run this seperately. Next next next and the install completed fine on my lab server.
With Workflow upgraded I skipped to the ServiceDesk install component in the main installer and carried on.
Process Manager seems to be working and I can see a few changes (like Select Group when Delegating an Implementation Task in CM).