You cannot install a game using a .rar file or any type of extraction program. However, you might have a .iso file, which is an disk image archive. You can mount this using a .iso mounter, such as Magic Iso. Then it will act as if you have the actual install disk in your computer and you can open it an install it.
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Just extract one of the .rar files into a folder. You don't need to do anything with all the other .rar files.
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to download the mods, no, but to actually install them you need some form of an archiving program that can convert files into .zip or .rar format
Download them, If they're zipped or in a rar file, Use winrar to open it, if there's models, Extract it to the model folder. Hope this helped - conorf1
You need a program that can open archives. The best free easy to use one is 7zip. Download and install it and right click on the rar file and go to 7zip in the menu and then click open as archive. Then drag and drop the files needed into you minecraft saves folder.