When I download the mod it opens in WinRAR, I don't get a .jar file

Closing due to inactivity/no responses.

from where did you download it? you can download it from curseforge or https://masa.dy.fi/tmp/minecraft/mods/client_mods/
.jar file can also be opened with winrar (but you don't need to do that)

@Ezgon did it work?