1. Before installing mods you should create your own backup. 2. If you don't want to verify all files with steam or you have non-steam version then you can download this 3. If you have steam version then you can use verify files integrity option, it will check and download all necessary original files
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2. If you don't want to verify all files with steam or you have non-steam version then you can download this
3. If you have steam version then you can use verify files integrity option, it will check and download all necessary original files