Hi dickandanita
I'm also not with Laminar Research, just another simmer from the UK and I hope that you have investigated further, the advice given by my colleague Glenn down under.
From my point of view however, I would be grateful for a bit more information as I'm a tad confused by your original post. Specifically, what is meant by "it does not add to the livery"?
When you unzip an aircraft file into the C:\X-Plane 11\Aircraft\Laminar Research or C:\X-Plane 11\Aircraft\Extra Aircraft folders, that in itself should be enough for it to be recognised when your run the X-Plane 11 application.
Whether the aircraft has just a default livery or a number of liveries to choose from, will be wholly dependent on which aircraft you are trying to install?
Please advise?
Regards