'Aircraft is already installed'

[Loadhaul 1]

Hi.
I recently installed a livery by accident confusing that it was no updated for P3D, I dropped the livery in as instructed, all other liveries are fine that I've installed.
I installed it and as it was out of date it did not show in the folder, thus I couldn't get rid of the old files there.
I then reinstalled the entire bus to 'hopefully' remove the livery files.
I installed the updated livery of the fictional Airnorth A318 and it was apparently there, depicting that the 'aircraft is already installed.'
Where can I find if the livery is actually there or if it is a bug in the actual livery?