There are three liveries in the download zip file. Choose the one you like and copy to the community folder.

Paper has fine textures but this is intended to be a ceramic sintered surface.

Here's a fix for the black lines.

First download a working livery that doesn't have the black lines like Chieftah's American airlines here. https://flightsim.to/addon/43466/darkstar-american-airlines

Now go into that livery > chieftah-darkstar-american > and copy the MSFSLayoutGenerator.exe to desktop. Also go into SimObjects > Airplanes > Asobo_Darkstar_American > texture.american And look for both the .DDS and .JSon file of this "DARKSTAR_AIRFRAME_DECALS_DETAILSFUSELAGE_ALB.TIF.DDS" and "DARKSTAR_AIRFRAME_DECALS_DETAILSFUSELAGE_ALB.TIF.DDS.json" Now copy these 2 files to desktop.

Now go into the folder of a broken livery that shows the black lines like Facet Blue https://flightsim.to/addon/33927/darkstar-facetblue-livery
Open up its texture folder - Livery_Dark_FacetBlue > SimObjects > Airplanes > Asobo_Dark_FacetBlue > texture.FB - Now paste both those DDS and Json file in here. Then go back to the root folder "Livery_Dark_FacetBlue" That contains the Layout.Json and paste the MSFSLayoutGenerator.exe and now drag and drop the Layout.json file onto the exe and it will rebuild the layout.json to include the new DDS and Json you just added.

Basically the problem was some modded liveries did not have .DDS replacements for all images/textures, so the sim would fall back to the default textures if any were missing, resulting in it using those black line textures, This fix makes sure it uses a transparent empty texture so it doesn't fallback.