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I know its probably a stupid question but how do I install it do I just replace the old files with the new ones in the pack? or do I just unzip to my HOI directory?
If you are running 1.06 or above you only need the actual pictures from the Pic Pack, not any of the .txt or .csv files. You especially don't want to extract the .txt file(s) since they are older than the ones you already have. Also, if you have CORE they include the pictures so you don't need the pack at all (though you will need to move them from the mod-core directory to the main directory if you want to see them in vanilla HoI).