Most answers are in the guide. If not, write to us - a person answers, usually within a working day.
The textures are looked up by the names written in the FBX, next to the model and in its textures folder. Check that the files are there and use PNG, JPG, TGA or similar - and that their names follow your project's slots.
Install the add-on from the Bridges tab and restart the 3D app. The link uses ports 52710 / 52711 on this computer; if another program holds them, close it and press the app's card again.
Yes - every check can be switched off or tuned in the project, so one client's rules never get in the way of another's.
In %APPDATA%\3DAssetInspectionSuite on your computer. Projects are plain JSON files in project_settings - copy them to share with the team.