Due to the modified interior you have to install it the old fashioned way.
It's not possible to install my liveries with the Twin Otter Extended Livery Manager!
Just follow the instructions in the Install.txt
HAving an issue with install.. I use the livery manager and everything seems to upload fine but when I select the aircraft from the scenario screen, IT doesnt have a preview and if I try to load into the sim, it just reverts back to the previous plane.. any suggestions?