Hello 🙂
i have downloaded the pack 3 days ago and the same problem with the black lightbar.
The problem is that the "lightbar and lightbarglas" texture is not saved correctly. Because the lightbarglas has to be transparent the texture must be save as at least DXT3 or better DXT5. In my case it was not 🤔 so the game show the transparent parts black and not coloured. to solve the problem open ytd file and export the "firebeam_essentials" texture. Then open the texture with for example paint.net and click save. In the "save-window" choose in settings "BC3(DXT5)" and make a checkmark at "generate Mip Maps", then click ok. After that replace the old texture with the new saved one.
I hope that it will work for all of you guys, for me it worked 😉
Greetings from Germany