It used to be an installable, but now it is a .rar and idk where or how I should install it.
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Understandably, Optifine HD Mod is a performance-related tool that can provide a huge FPS boost and significantly reduce latency. Basically OptiFine HD Mod is a very useful tool that helps you adjust your Minecraft settings effectively. It makes games run in a smoother way and uses fewer resources. Besides, it allows you to run HD textures and resource packs without installing other mods.
https://wminecraft.net/optifine-hd-mod/
did you check the company's website?
WINrar, or Winzip.
a RAR is an Archive and similar to a ZIP. You have to Unpack the RAR to Extract the installaation files. WinZip can unpack RAR files and I am sure lots of other Archive creation software can also do the same.