Abnormal colors in lightning FS2004

Hello, I need some help, I installed some "improvement" of the FS2004 scenery and lightning are now exploding in various colors (green, blue, red, yellow) and no more white. And also the thrust of a military aircraft (F14D) is no longer yellow, now appears green.
I do not know how to revert it back to the default FS2004. Please if anyone knows how to do this please help me!
Thank you in advance for any instruction.
I do not know how to revert it back to the default FS2004. Please if anyone knows how to do this please help me!
Thank you in advance for any instruction.
