Hi, it’s not clear why you tried to use Generic Server export if you’re just using IIS - this is already done automatically for you. Unless of course you are using something else like Apache? The export needs an actual file path, not just a folder name and has to run as an authorised user because it does not run as your user account.
Please email support at certifytheweb.com with details of your actual real domains/sites if they have to be confidential. Hiding your domain here just means nobody can really help.
The app is used by thousands of people per day so I can assure you the process does work well, however I can see you may be trying to do many things at once, which is making the process unusually complex.