Since I discovered Zmodeler to porting some models in GTA 5 I want to create a clone trooper ped model with the files from this website.

Spoiler:

The mod is almost done but I have some textures bug with the mod because I don't have the spec .dds texture file and I don't know how to create it (I'm a beginner in modding).
So somebody knows how to create those textures files for this mod ?

A little representation of my mod now:

Which program do you use for texturing?

I use Zmodeler for porting the mod and texturing it with the files I have downloaded from P3DM.

Try to see if this tutorial could be useful to you: https://www.youtube.com/watch?v=prwc95KTsvY

For the specular map creation in the tutorial a fairly simple program called Gimp is used, which you can download and install completely free of charge, without any requirements: https://www.gimp.org/. You can find the dds plugin for it here: http://libregraphicsworld.org/blog/entry/normalmap-and-dds-plug-ins-updated-for-gimp-2.8

But the procedure of applying the texture to the model for GTA 5 is unknown to me, so I hope you have some experience with that.

Thanks for the help I will see if it works on my model.