Well, that's easy.
Download all the patches in order up to 4.12.2. You can find them on mission 4 today.
When you get up to 4.12.2, if you want to use mods, make a copy of the game folder. Rename the copy folder whatever. Then finish downloading the remaining two updates 4.13.1 and 4.13.2. and install to the non copy folder
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