After a more then year of not playing the game I came back to it and found that my version (Better Repack 9) of the game is hopelessly outdated. How do I update the game? Just download the new version and install it abowe the the old one?
To add on to Boogie's explanation, you'll also want to copy over any mods that you downloaded independently that may not be included in the better repack mod list (I've made that mistake once, it was a b*tch to hunt down all my old mods). If you didn't download any mods on your own time, then ignore this piece of advice.
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. You may be tempted to just 'update', but since you're so many versions behind, I would highly recommend just downloading R16 as a whole, then, as Boogie suggested, making sure everything's running correctly and finally copying over your UserData folder (and any mods, see my first paragraph).