Forge for minecraft 1.11.2 problems

[ZombiieUnicorn]

Hello, 
I tried to install some mods on Minecraft 1.11.2 (Voxelmap and Optifine), I followed all the steps I was told but when I had to open the .jar file in the "version" folder, there was only the .json, no .jar. So I tried with another version of Forge (the first one was the 13.20.0.2252 and the second one was the 13.20.0.2228) but the problem was still there. I also tried with and without Mercurius but it made no differences at all. Can anyone help me, please? Thank you a lot in advance 
ZombiieUnicorn

[ZombiieUnicorn]

Well, in all the tutorials I followed they tell that there is a .jar file with the .json and in every other version folders, there is a .jar file. And furthermore, when I copy the mod file in the "mods" folder and launch Minecraft, the mod doesn't work and he isn't even in the mod list.