I don't see a lot of installation problems. It is very important that you follow the installation instructions to the letter (in terms of the IIS configiuration). If you have validated that I would suggest that you contact the hotline so they can escalate to someone that would know far more about this than me.
I'm getting a web config error when I start FreeFlow Core:
HTTP Error 500.19 - Internal Server Error
Detailed Error Information:
|IIS Web Core|
|Not yet determined|
|This configuration section cannot be used at this path. This happens when the section is locked at a parent level. Locking is either by default (overrideModeDefault="Deny"), or set explicitly by a location tag with overrideMode="Deny" or the legacy allowOverride="false".|
|\\?\C:\Program Files\Xerox\FreeFlow Core\Web\web.config|