Eric is right, based on your screenshots (in the first post) the Workflow Admin Account was not configured to be in an e-mail format as Workflow Setup expects.
The requirements for the account formatting are unfortunately not clearly defined neither in the UI nor in the documentation. We are working on amending that.
Workflow Admin Account is the account that in previous Workflow versions was defaulted to admin(at)logicbase.com or admin(at)symantec.com. It will be a hardcoded admin account native to Process Manager. To make sure AD Sync does not try to interact with this account, it is recommended not to use an actual AD account for it.
This is the KB article you want to take a look at:
TECH199572: Workflow part of the ServiceDesk 7.5 installation will fail if the admin account name is incorrectly configured
Regarding the message about database, if you are installing into a new database, that message appearing in log is completely normal (as the database just does not exist yet).